A friend has a condo in Hallandale, I've ridden on a folder in the Miami area. I was expecting extreme heat but was surprised that South Florida climate was quite moderate, often cooler in summer than DC area, plus the clouds make riding more comfy. Biking turns out to be very popular in the Miami area with many bike lanes, wide shoulders & drivers that are used to bikers.

Also surprised how the South Florida area goes from heavily urbanised to relatively unpopulated areas--a look at the map suggests Rt 41/90 is the only road from Miami to Everglades City--is that the route you're going to take? Of course in Florida highways can provide nice riding with the wide shoulders & good visibility. Once I rode over the I-195 causeway, not realizing it was a no-bike interstate. Didn't even get stopped by cops.

OTOH I did get a warning ticket in Bal Harbour for riding on the sidewalk. The 1A road there is a fast & narrow 40 mph limit IIRC. The cop told me to ride the bike path so I went over to the beach path & a local warned me bikes were prohibited there also. Oh well, riding to South Beach is the only time I've been passed by 2 Ferraris & a Lamborghini in a 12-mile ride!