Hey I am in Ft.Lauderdale, and there are tons of group rides in ft.lauderdale and miami.
If you let me know what your average speed is, I can point you in the right direction as to rides.
The majority of the group rides down here are fast(mid to high 20s with pacelines and sprints into the 30s), they are usually shorter rides- about 40miles but fast.
There is also a group called South Broward Wheelers, if you google them you can find their website, and they are more of a touring group. They have groups that go out at different levels, at slower paces and their rides are posted on their site. I have never riden with them, but a lady who works out at my gym is a member and she loves it.
So let me know and I am more then happy to help you out!!