Thanks for the advice.
I eventually found a small company, Aquatic Rental Center, in Pelican Harbor Marina.
URL is arcmiami.com.
Boats a tad shabby, but they had a couple of Catalina
25s, a couple of J boats and a newer Hunter
First few days here we had winds in the high 20s and low 30s, so no sailing. but the winds dropped today to 15-ish and we had a good sail on Biscayne Bay on one of the 25s.