Vizcaya is a wonderful stop in the Miami area, c/w gardens and an old mansion to tour.
Also I hear the Redland Fruit and Spice Park
http://www.fruitandspicepark.o... is not to be missed. I'm going there for my first visit in May for their big orchid festival.
There are nurseries on every street corner, especially in the Homestead area but you'll miss out on them if you let the guys drive, and you end up on the Interstate. Take back roads. There is golf everywhere, so find a course for the fellows, then take off with the car for garden adventures. Being an orchid nut, I'd recommend you find RF Orchids in Homestead and then ask them where to go from there to enjoy garden tours. Mostly just walking the streets will be a garden tour for you, I'd think. Even visiting a Home Depot or Lowe's garden center will be an adventure.
I'd caution you to make reservations if you're headed down the Keys. You could book one place for the whole time you're there, then just 'meander' out from it. Day trip down to Key West, day trip to Pennekamp Park on Key Largo . . . etc. You're coming at the absolute height of tourist season, and most decent places will be full. We've had a super busy season this year due to the terribly cold weather in the Northeast. You may end up with either something really expensive or really scuzzy. Or both!! Key West especially gets booked well ahead, especially on weekends. Even in the off-season you can't hardly book a room there on a weekend.
