1. Soak in the Blue Lagoon
A constant presence in lists of the world's natural wonders, the Blue Lagoon - Iceland’s most famous thermal bath - is a magical sight with pearly blue waters dotted against a landscape of black lava rock. The steaming pools can get pretty crowded, so visit early in the morning or late in the evening for a relaxing soak with cocktails from the swim-up bar. There a spa treatments available, or you can DIY like the locals and slather yourself in chalky white silt from the lagoon bed, which supposedly has anti-ageing properties.