A great way to relax? floating in the hot tub. Don't turn it up all the way, just warm enough to feel like a warm bath, get in to one of the "seat" areas, and lay back, close your eyes, let your feet float and relax. The built in seat keeps you from sinking and drowning, but you can still feel buoyed and "weightless". I find it a great way to totally relax.
Do not drink alcohol before doing this, ever!