Proper wood-fired heat with Atlantic views and the Paps of Jura behind you, for £15 a session — genuinely local and small-scale rather than a resort spa. Location moves week to week, so check the venue's site or social media before you set out.
A mobile wood-fired sauna that rotates between three spots on Jura's east coast — Craighouse, Corran Sands near the airstrip, and Bothan Jura Retreat at Knockrome. Book a 60-minute session, then plunge into the sea or the ice barrel.