Scuba, once you are certified, is relatively cheap as hobbies go. Wouldn't be worth it really.
Now, planning ahead, flying down to the Keys, load up on fish (snorkling gear and "slurp" guns needed, or hands and nets),, and drive back. Of course, handling the salt water fish while traveling will be tough. A friend used to make beer money slurping reef fish for local shops when he lived in Miami.
Of course, you get the exotics in the canals and such in Miami - oscars, tilapia, peacock bass, cichlids, etc.
Here in N. Florida, you occasionally see mollys or hints of fancy guppy in the native minnows. Also, the native freshwater fish are just beautiful. I'll put a bluegill (esp. a male on his nest) against cichlids or an oscar for aggressiveness any day. Plus the crawdads, bass, shiners, warmouth, gar, bowfin, etc.