Another good place to pull out after the Miami-Key Largo race is the Jewfish Creek Marina. I had forgotten about it until I saw the owner today.

As soon as you go through the Jewfish Creek Bridge, Gilbert's will be on your right, and the Anchorage is on your left. Take a left and go down the canal to the end, where the Marina is. They have a ramp, and it will only be $5 to take your boat out there. It is $10 for an in-and-out, but $5 if you are only exiting there. Pay in the Marina office.