Sky Lagoon is a coastal geothermal spa just outside Reykjavík where you can relax in warm, mineral-rich seawater with a dramatic infinity-edge view of the ocean. Book tickets in advance and decide if you want the extra Sky Ritual package for the guided steam, cold plunge, and sauna sequence. Tickets start at about $100usd for the classic but you can upgrade to include robes and the 7 step ritual. Shower thoroughly before entering, use the provided lockers, and plan on about 90–120 minutes to fully enjoy the pools, hot spots, steam rooms, and the on-site bar and cafe. It’s adult only and I do recommend booking a time slot in advance as it does sell out.

Depending on your flight time if Sky Lagoon can work great on arrival or departure day