South of Sarasota on Siesta Key, the snorkeling at Point Of Rocks at the south end of the famous white sand Crescent Beach is popular with tourists. While the visibility is always very low, it is the best Siesta Key snorkeling. Except for the Point of Rocks snorkeling spot at the far southern end of the beach, the rest of Siesta Key Beach is known for its sand flats where the only marine life you may encounter is the occasional yellow spotted stingray or bottlenose dolphin.
For the best visibility, try the mornings before the wave action kicks up due to the afternoon winds. Winter and spring are the best for visibility amongst this limestone formation that is the habitat for small marine life, sponges, hermit crabs and crustaceans. During the summer, visibility can sink to below three feet. From November to February, the water temperature can be a little too cool for most snorkelers without a wet suit.
After a long morning of snorkeling, try heading to the local favorite Capt Kurts, which is just across the road from the parking lot.
To reach the Siesta Key snorkeling from US75, use Exit #205 for Clark Road. Head west on Clark Road (which becomes Stickney Point Road) past US41 onto Siesta Key. Turn left and park on the right. The closest public beach assess to Point-Of-Rocks is Beach Acces #13 off Point Of Rocks Road, however there is no parking. Public Beach Access #12 has parking but is a further walk and you've got to arrive early to get a space.
Overall, Siesta Key is the 7th most popular snorkel dive spot of all 18 snorkeling dives in Florida Gulf Coast.