Jetty Park which is a city owned park, near Melbourne, as close to the beach as you are likely to see but it's still a couple hundred yards. Anastasia State Park near St Augustine is on the beach. There are some panhandle state parks on the beach but I haven't been to them.
Of course the parks in the Keys all have beach access both private and state.
Arctic Fox 25Y Travel Trailer
2018 RAM 2500 6.7L 4WD shortbed
Straightline dual cam hitch
400W Solar with Victron controller
Superbumper