For Key West, I've heard nothing but good about Bluewater Key park (well, except that it's incredibly expensive). We're headed there this winter and will be paying $175/night after taxes.
Bahia sounds nice, but being in a big rig (42' fifth wheel + crew cab/long bed truck) - I worry about being able to fit. Plus, I've heard that getting reservations can be difficult.
For Orlando area, we are Thousand Trails members and can't beat the price of the TT Orlando park in Clermont. It's a nice park- we've stayed there twice now (once over Christmas 2012 and more recently over July 4 of this year). The summer months are their off season so the # of activities are fairly low (daughter wanted to do the craft that they advertised, but they said they weren't doing it right now).