Arrival, and a first soak that isn't the Blue Lagoon
Arrive at Keflavík and pick up a hire car
This is a self-drive loop, so collect a car at the airport; it is roughly a 45-minute drive into Reykjavík. Two things to fix in your head before you set off. First, the season: this itinerary assumes the autumn shoulder, roughly late August to early October, when the roads are almost all still open, the driving is manageable, and the nights are just dark enough for a chance of the Northern Lights. Second, driving here is not like home, weather turns fast, so check road.is for conditions and safetravel.is before any longer leg, and a standard 2WD is fine for this whole route in that season (you would only need a 4x4 for the highland F-roads, which this trip deliberately avoids). Book flights →
Check in in central Reykjavík
Base yourself in central Reykjavík for the first three nights; everything on days one to three is an easy day-trip radius from here. Drop the bags and sort out swim kit, you will be in and out of geothermal water most days, so a quick-dry towel and flip-flops earn their place. Search hotels →
Evening soak at Sky Lagoon, Kópavogur
Skip the Blue Lagoon entirely and start instead at Sky Lagoon, an oceanfront geothermal lagoon about 15 minutes from the centre in Kópavogur, with an infinity edge that drops straight towards the North Atlantic. It runs a seven-step Icelandic bathing ritual (the Skjól), including a cold plunge and sauna; the basic Saman package starts at around 12,990 ISK (roughly £75), depending on the time slot, and includes a towel. It is still a built spa rather than a wild pool, but the setting is genuinely lovely at dusk and it eases you into the week. Book a time slot in advance.
Dinner in the old town
Wander back into the centre for a first Reykjavík dinner, the streets around Laugavegur and the old harbour are thick with good places, from Icelandic lamb and fish to the famous harbour hot-dog stand if you want something quick. Keep it easy; you have an early-ish start and the Golden Circle tomorrow.
The Golden Circle's geothermal side
Drive to Þingvellir National Park
Head out on the Golden Circle loop, starting with the 45-minute drive to Þingvellir, where the North American and Eurasian tectonic plates are visibly pulling apart. It is not geothermal, it is the other half of what makes Iceland Iceland, but it is on the way and worth an hour walking the rift-valley path before the geothermal main event.
Geysir and Strokkur in the Haukadalur geothermal field
About an hour on from Þingvellir, the Haukadalur valley is where the ground actually boils. The original Geysir is mostly dormant now, but its neighbour Strokkur erupts every 6 to 10 minutes, throwing scalding water 15 to 20 metres up. Take the geothermal-ground safety seriously here: the water and steaming vents sit at up to 95°C and the crust around them is thin, so stay strictly on the marked paths, keep well back from the pools, and never touch water of unknown temperature. Entry to the field is free; parking is around 1,000 ISK.
Gullfoss waterfall
Ten minutes further up the road, Gullfoss is the third of the classic Golden Circle trio, a huge two-tiered waterfall crashing into a canyon. It is a quick stop rather than a long one; there is a café at the top if you want lunch with the view before you turn south.
Soak at the Secret Lagoon, Flúðir
Drive about 40 minutes south to Flúðir and the Secret Lagoon, known locally as Gamla Laugin, the oldest swimming pool in Iceland, built in 1891 beside a small geothermal field where a little geyser still bubbles away on the edge of the grounds. It is deliberately low-key: a simple, naturally warm pool that holds 38–40°C year-round, and a world away from the Blue Lagoon's scale. Admission is around 4,500 ISK (about £26); it is open until 20:00 in summer and 19:00 through winter, so there is no rush. Book ahead on weekends.
Drive back to Reykjavík
From Flúðir it is about an hour and a half back to Reykjavík on good paved roads. This is a long, satisfying day, so ease into a quiet evening back at base.
Hike to a hot river at Reykjadalur
Drive to Hveragerði
The centrepiece of the whole trip is a hot river you have to walk to. Drive about 45 minutes east to Hveragerði, a small town that sits directly on a geothermal field, steam rises straight out of the ground in the middle of it. Park at the Reykjadalur trailhead just above the town.
Hike up Reykjadalur to the thermal river
From the car park it is a 3.5 km walk (about 45 to 60 minutes each way) up a valley of steaming vents and bubbling mud pools to a river that is genuinely warm enough to lie in, around 30–40°C depending where you sit, cooler downstream, hotter as you go up. This is wild geothermal ground, so the same rules apply as at Geysir: stay on the marked path, keep clear of the boiling side-pools and mud pots, and only get into the river itself where the boardwalk and changing screens mark the bathing stretch, because water off the main flow can scald. Bring your own swimsuit, towel and water; facilities are just basic screens.
Lunch in Hveragerði
Back down in Hveragerði, warm up over lunch, the town is known for greenhouses heated by the geothermal field, so this is good country for a plate of soup and fresh bread, or a coffee and cake, before the drive back.
Drive back to Reykjavík
It is a straightforward 45 minutes back to the city. Rest up before the evening, and if the sky is clear tonight, you have a decent shot at the Northern Lights.
Northern Lights hunt from the old harbour
In the autumn shoulder the nights are dark enough for a real chance of the aurora, and a guided boat or minibus tour is the sensible way to chase it: the guides track the forecast, drive to wherever the sky is clearest, and know how to read the cloud, none of which is easy to do yourself on a first trip. Nothing can promise the lights will show, they need a clear, dark sky and a bit of luck, but reputable operators will rebook you if the trip is a wash-out. Search Northern Lights tours in Reykjavik on GetYourGuide →
West to the whale fjord and Deildartunguhver
Drive to Hvammsvík Hot Springs, Hvalfjörður
Check out and head west into the quieter half of the trip. About 45 minutes from the city, tucked into the Hvalfjörður fjord (the 'whale fjord'), Hvammsvík is a cluster of natural pools built right at the tideline, so the sea genuinely washes in and out of the lower ones and the temperature shifts with the tide. It is a fraction of the Blue Lagoon's crowds; admission starts from around 5,900 ISK (roughly £35) and rises with the package and time slot. Book a slot in advance, as numbers are capped on purpose.
On to Borgarnes through the tunnel
From Hvammsvík carry on around the fjord to the Hvalfjörður tunnel, which dives under the sea and cuts what used to be an hour's drive around the fjord down to about seven minutes. It is roughly 45 minutes in total to Borgarnes, a small town on a spit of land that makes an ideal base for the west. Check in and drop the bags. Search hotels →
Krauma Baths at Deildartunguhver
Drive about 30 minutes inland to Deildartunguhver, Europe's most powerful hot spring, which pumps out a staggering volume of boiling water, you can walk the boardwalk beside it, but keep back, as it is genuinely 100°C at source. Right next door, the Krauma baths blend that scalding water with cold glacial water to fill five outdoor pools plus saunas and a cold tub; admission is around 7,900 ISK (roughly £47). It is open until 21:00. This is the west's answer to the tourist-trap lagoons, and far quieter.
Dinner in Borgarnes, and eyes on the sky
Head back to Borgarnes for dinner, the settlement museum's restaurant and a handful of harbourside spots cover you. Out here, well away from the city's light, you have a better aurora chance than in Reykjavík if the sky stays clear; no tour needed, just step outside, let your eyes adjust, and look north.
Snæfellsnes: seals, sea cliffs and a lava cave
Drive onto the Snæfellsnes peninsula
Today is the big loop, a full, long day out on Snæfellsnes, the peninsula often called 'Iceland in miniature' for packing a glacier, lava fields, black beaches and fishing villages into one arm of land. From Borgarnes it is about 35 minutes on Route 54 to the first stop, so make an early start and pace yourself; this is a lot of driving with many short stops rather than one big hike.
Seal-watching at Ytri Tunga
Ytri Tunga is a low golden-sand beach on the south coast of the peninsula and one of the most reliable places in Iceland to see seals hauled out on the rocks just offshore. Bring binoculars if you have them, keep your distance and stay off the slippery rocks, and don't approach the animals, watch from the beach and let them be.
Búðakirkja and the Arnarstapi–Hellnar coast walk
Stop at Búðakirkja, the lone black timber church standing in a lava field, then drive on to Arnarstapi. From there a well-marked 2.5 km coastal path runs to the tiny hamlet of Hellnar, past sea arches, basalt columns and cliffs loud with seabirds, one of the loveliest short walks in the country. Walk it one way and back, or leave a car at each end if there are two of you driving separately.
Djúpalónssandur and the Vatnshellir lava cave
Round the western tip into Snæfellsjökull National Park. Djúpalónssandur is a dramatic black-pebble beach with old lifting stones fishermen once used to test their strength, and the rusted remains of a wrecked trawler scattered across it (leave them where they lie, it is a protected memorial). Nearby, the Vatnshellir cave is an 8,000-year-old lava tube you descend into on a 45-minute guided tour; caving here must always be guided, never attempted alone, and the operator provides the helmet and torch. Tours run daily and cost around 5,900 ISK; if you would rather be above the ice than below the lava, guided glacier hikes up Snæfellsjökull also leave from Arnarstapi, and those too must always be done with a mountaineering guide and crampons, never solo. Search lava cave tours in Snaefellsnes on GetYourGuide →
Kirkjufell and check in at Stykkishólmur
Carry on along the north coast, past the fishing towns of Hellissandur and Ólafsvík, to Kirkjufell, the perfectly pointed mountain beside Grundarfjörður, with the little Kirkjufellsfoss waterfall in the foreground, probably the most photographed hill in Iceland. From there it is a short drive to Stykkishólmur, a pretty harbour town, for the night. It has been a big day, so keep the evening simple. Search hotels →
A last town-pool soak, and the road back
A slow morning in Stykkishólmur
No rush on the last morning. Wander Stykkishólmur's brightly painted harbour and old houses, climb the little Súgandisey lighthouse island for the view over Breiðafjörður bay, and grab a coffee before the drive south.
One final geothermal dip at the town pool
The truest Icelandic hot-spring experience isn't a designer lagoon at all, it is the local swimming pool, geothermally heated with outdoor hot-pots, where the town actually gathers. Stykkishólmur's pool is a lovely, cheap (a few hundred krónur) send-off; rinse in the showers first, as everyone does, and soak in the hot-pots one last time before you point the car south.
Drive back towards Keflavík
It is a long final leg, roughly 2 hours 45 minutes from Stykkishólmur back down to Keflavík, so this itinerary works best with an afternoon or evening flight home. The drive back along the coast and through the tunnel is scenic and easy; leave a comfortable buffer for fuel, the car drop and check-in.
Drop the car and depart from Keflavík
Return the hire car at the airport and head off with a week of real geothermal Iceland behind you, a hot river, a tidal fjord pool, Europe's most powerful spring and a country pool full of locals, and not a Blue Lagoon queue in sight. Book flights →