The Canberra outpost of Tasmania's Lake Derby Floating Sauna sits on a pontoon off Yarralumla Beach East on Lake Burley Griffin. It has two independent wood-fired sauna rooms of Finnish cedar, each seating up to six, with floor-to-ceiling windows over the lake. Guests join a shared session or book a private one and cool off with a dip in the lake or a cold shower on deck. Open daily 7am to 9pm; sessions cost $55. The site is off-grid with no toilets.