Cedar Keys
Go to Cedar Keys, FLorida. A tiny airport like in the gulf of mexico..thats nice. Fun place for a night or two too. No parking fee but no refueling too. But a nice lady comes pick u up in her cab..charges $10 for both ways and she can talk to u on the unicom.
Else depending, maybe head out to Bahamas. Not sure of other places. I did fly to pretty much all the airports in Florida.
The fancier the FBO the more expensive fuel, or they charge you fees to use their crib. Better to stick to the airports which are a bit dinky or something like that if you want to save on cash. Boca Raton is expensive but they give you car to drive around town. But charge of avgas was $1 more then other places.