1) Helps hope our experiences over the past few years hold up and we have a mild season-- just never know. Can't help with reservation cancellation
2) For the Keys, you will probably be OK for most commercial places ( except Blue Water) during that time frame without a need for way in advance reservations. State Parks in the Keys may also be fully booked-- look on Reserve America. One of our favorite places is Curry Hammock and there is no problem with a 43' coach--- we are heading to Blue Water at the end of the week for a week, then 2 weeks at Curry Hammock. You mentioned Miami area-- Larry and Penny Thompson County park is nice and big rig friendly. Near Dania, is Aztec RV resort- a very high end place.
3) If you will list areas that you might be interested in, we'd be better able to make recommendations.
4) If you plan to take any toll roads, pick up a Sun Pass transponder. I think they are $4.99 - it will save you $$'s in tolls. Here is where you can get one.
"Purchasing a SunPass Mini transponder
or Portable transponder
is easy because they are available at nearly 2,000 retail locations throughout the state. Retailers include Publix Super Markets, CVS Pharmacy stores, Walgreens, Amscot Financial branches
and AAA South
offices in Florida. They can also be purchased at Navarro Pharmacies
and Sedano's Supermarkets
in Broward and Miami-Dade Counties. Transponders are available at all Turnpike service plazas, Turnpike gas stations and SunPass Service Centers. "