I lived in Miami for a couple of years and was just there last week. Cycling sucks there for certain as the drivers are very very aggressive. Not overly bike friendly. It is a big place, where in Miami are you going to be staying? North, South, coast? I lived in North Miami, which wasn't all that nice. I also had a job that was into demographics and learned the area very well. If I was to ride a bike there, I am thinking around A1A areas are best. You don't want to be in areas that cars can fly, because they do. Lots of crazy driving there and high stress. Florida isn't a very good state in general for cyclist, except mostly on the west coast. That is a little better compared to W. Palm and down on the east. Jacksonville would suck with all the red necks as would most of the interior of Florida. It really isn't a good state over all for cyclists. Old people, tons of red necks from the interior, crazy drivers from NJ and NY in the lower east coast. I don't mind riding in Sarasota and Venice. Those areas were pretty good IMHO, but of course flat.

You could take up running for a couple of months.