>>662552Florida's a pennisula with a shit ton of lakes and rivers, so water activities are where it's at: kayaking, canoeing, sailing, fishing, scuba diving, snorkeling, spearfishing, surfing, kiteboarding, sailboarding and hiking through Big Cypress.
I recommend a kayak as an affordable introduction boat, you can always buy a bigger/better boat later on. Chances are there's a body of water within a couple miles of your house, and an awesome one within an hour's drive. This is all from personal experience, I've done everything I listed, and started off canoeing and kayaking.
I also enjoy biking because where I live has lots of cool back dirt roads.