great spot without a car?

We're planning our spring break trip for next March and are looking for someplace warm (and warm is relative since we'll be coming from Iowa!)to camp for a week. We won't be towing a car, so would like to be able to walk or ride our bikes to town for shopping and restaurants. Close to a beach or lake would also be nice. Alternately, we do have a golf cart and could tow that, so if you know of anyplace where we could bring our own golf cart for buzzing around, we'd like to hear about it!