Southeast of Miami, the snorkeling in Cape Florida State Park is not well-known since there are no reef formations close to shore. But, there is fair snorkeling just offshore of the popular lighthouse around the rock jetty. Be aware that there is a active boating channel just offshore, so make sure to use a diver-down flag. The best snorkeling is during calm surf and no wind. During Bill Baggs Cape Florida State Park snorkeling, you may encounter spotted stingrays, queen conch, loggerhead turtles, green sea turtles, hawksbill turtles, manatees and some seahorses among the sea grass beds.
To reach the Cape Florida snorkeling from Miami, head south on US95 to Rickenbacker Causeway. Follow the causeway to the southern end of Key Biscayne. Inside the state park fee gate, use the southernmost parking lot near the lighthouse. Do not use the main path to the lighthouse since there is not water access. Instead, use Beach Access #7 located just to the north of the lighthouse.
To reach the snorkeling in southeast Florida by air, there are several options. The most popular option is to fly into Miami International Airport (MIA), which is served by all major US and international airlines. Also nearby, a potentially lower cost option is to fly into Ft Lauderdale airport (FLL). From either of these airports, you can rent a car to drive to the dive site, but watch out for automated cash-less toll highways along the way.
Overall, Cape Florida State Park is the 22nd most popular snorkel dive spot of all 24 snorkeling dives in Florida Southeast.