Snowbird sites where you can grow vegies/flowers?

we are at a wonderful park in Rockport, TX and we are getting ready to do our gardening in containers (5-gal. buckets). We will have tomatoes, cheery tomatoes, herbs, and beans. No peppers as they are cheap here. We also have two small lemon trees, cactus, and many small plants on our patio. In south-TX you actually get a double growing season to!