Weather is usually great that time of year. There are dive charters spread out in the area depends where you are staying and what kind of diving you are interested in. Dive Stop is in North Miami (305)940-0926, they allow spearfishing. If you want to check out a really awesome reef I recommend taking the 2.5 hour trip down to Looe Key and taking the charter from Looe Key dive center it is worth it.