Geothermal pools at the Blue Lagoon Retreat (the upgrade with the underground volcanic spa + private thermal baths), Sky Lagoon's seven-step ritual on the bride's last evening, Northern Lights chase if winter. Day-two Golden Circle in a 4WD (Þingvellir, Geysir, Gullfoss waterfall). Day three: Hallgrímskirkja observation tower + Laugavegur Street boutique walk. Keflavík (KEF) is 45 min south.
Five quick questions, then we build the full itinerary — lodging, daily schedule, dining, bars, the group-chat message — and drop you into a Trip Room you can share with the bridesmaids.