Cornwall, United Kingdom
The Scarlet sells itself as "an eco-hotel for grown-ups". That means relaxation rooms slung with hovering, adult-sized nap cocoons, an Ayurvedic spa and a seriously special restaurant which serves the sort of seasonal curiosities that would be lost on younger palates (sorry kids). Nowhere is its do-good, feel-good ethos better demonstrated than in the pool - a cradle of fresh saltwater, naturally filtered by reeds, which looks out over the regular swill of surfers cutting shapes on Mawgan Porth's Enid Blyton-perfect beach.
Tredragon Road, Newquay TR8 4DQ