No OP, but I will offer this: Some may say downtown areas are walkable, but you are severely limiting your access to resources. Public transportation in South Florida is poor. One train line runs north/south between Miami to West Palm Beach and it is not the most reliable. Miami has an above ground metro train which gets you to most areas there and is actually pretty decent. There are many buses but I have not invested the time to understand them. For the most part anywhere else in South Florida, you better have Lyft or Uber at the ready.

Sure, you could find a place where you can walk, but it's not really that common unless you're in a densely populated area. I biked exclusively during college and did relatively alright for a few years but I upgraded to a car as soon as I could afford to.