The Mayan ruin Altun Ha had a "hot tub" area. It's filled in with grass now. Your Belize retirement could include a more modern hot tub.
LiveAndInvestOverseas.com for more info. Kathleen Peddicord and Lief Simon from "Live and Invest Overseas" will guide you thru your Belize retirement, including moving to Belize and living in Belize, "warts and all".