I have some family in Florida - my daughter wants to use the money she saved all year to go to a (now canceled) mission trip to Belize to go to florida instead. I told her to wait it out first as we really do not know when things are going to "open up" in a sense.
The problem with that - in Florida they are Closing the beaches - not sure how you can really close a beach - but my niece in Florida sent a facebook update stating this - she has no reason to make it up.
I would guess though if you rented an one on the beach it would be potentially private property so you could hang on the beach - just make sure you bring your own toilet paper with you on the plane ---
Also if you get a private house with a private beach you wouldn't need to worry about crowds.