Not a water park but an experience no child forgets: floating in milky-blue geothermal water at 38 degrees while cold Icelandic air nips at your ears, silica face masks optional but universally applied. Children under fourteen enter free with a paying adult, though under-twos aren't admitted. Book the first morning slot online well in advance — the lagoon at 8am is a different, calmer place — and slot it in en route to or from Keflavík airport.
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Milky geothermal water at 38 degrees in a black lava field, steam drifting over silica-smoothed rocks — Iceland's most famous soak is unapologetically touristy and doesn't care; neither will you. Book the evening slot in winter, when floodlit steam and the chance of northern lights turn the lagoon frankly cinematic. Stay at the Retreat for access to the quieter private lagoon, and slather on the complimentary silica mud mask — the romance will survive it.
Featured in Ten spa and hot-spring escapes to switch off together · Romantic