Half Moon Bay is the place to snorkle and find an assortment of marine life including sea turtles!
There are groups that offer excursions there, but if you have equipment and your hotel is nearby I would suggest going on your own. Then it is just you and you aren't having to wait for other people and can do what you want.
We saw sea turtles, an assortment of fish, sting rays and even a huge barracuda. As amazing as that is please remember to give the turtles their space and don't try to touch them or harass them.
Water is clear and shallow heading in so easy for new snorklers. Will definitely visit the bay again.
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