Not very close to the higgs beach . But you can take boat to the snorkelling locations near by one of is tortugas
If the wind is not blowing then it gets clear. Fort Zachary has more rocks and fish ect...but again when winds are southerly sand gets stired up.
If the water is clear then you can snorkel at Higgs Beach around the outside sea wall and pier. Say some cool things but not to the same degree as one of the boat tours. Also, Bahia Honda oark is around mile marker 30. Its a nice beach.
I think is called tortugas, but you have to take a ferry. I did not go there
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