Rent two sites, and use the 30a outlet from each ... maybe sites that are back to back rather than side to side so you don't need as much extension cord.
Running a generator at a state park that provides electrical hookups sounds like a big faux pas to me... plus several of the Florida State Parks website have this listed in the rules:
"Generators are not allowed in the campsites."
Interesting phrasing, giving the rangers a lot of enforcement leeway - a strict interpretation could be that mere possession of a generator is against the law whether it's operating or not.
