I feel like opening the parks at all in during a very trial time would take a lot of effort, energy, and potentially a waste of money. They're already losing money and I would think it would be ill advised if they opened when things are still unsure as they'd lose even more money if they put the effort, energy, time, money into opening something only for few to show.
If they opened at all I think they would (or at least I would) wait until things are "open" for a little bit (see how the general public is with other things being open within FL) before making any moves. I'd rather have others see how it goes than risk myself and other guests of mine. As for the general speculation of backlash, I feel like it would be a double edged sword. I feel if they opened, they'd receive it and if they left it closed, they'd receive it as well.
Yesterday I sat at a picnic table near a beach, but nowhere near anyone else to have a picnic with my two parents (first time I did something out of the house well over a month) and in the distance I saw a ton of bikers (10-15) of them stand along a small, narrow walk way, which also forced other people who wanted to go to the beach to walk past them. I think that was was disrespectful. Not only ignoring "social distancing" for themselves, but forcing others to ignore those rules for a brief moment. I personally feel the beaches shouldn't be opened at all. Other places to explore, but that's another debate.
That's only one example of the type of behavior that is going on and this is without everything being "open". That being said, considering I've seen that type of behavior as well as other questionable things, I think it will be a herd of people once it's "green to go", I feel like a lot of people will forget what they've learned during this time (not everyone, but a lot), and if it happens before there is really a solution I think it's going to cause more issues than anything.
As my father said, "Adults don't like being told what to do." Naturally there are a lot of reasons why people want things to open, but I think that phrase explains a lot of it when he expressed why he feels a lot of people are protesting so much about it. Once we grow up, we feel like we can do anything we want, and don't wanna be told what to do. It makes sense to me. If teenagers can rebel due to feeling like "adults", why can't adults?
Either way, they'll definitely have to be thinking of a strategy of how they should open regardless. Even if there is magically a vaccine and Florida decides to open, that doesn't guaranteed everyone has the vaccine and/or everyone is cured. They're going to have to test the waters. I just hope it's later rather than sooner to make sure they're prepared, as well as everyone else.