It would be a mistake to at least not go snorkeling at Hol Chan and Shark Ray Alley. If the other person doesn't swim, they can ride along in the boat and see many fish and marine life from the boat. Glass bottom boats are available as well, and you can snorkel from them.

I'm not sure if this person just 'can't swim" or is terrified of the water, but most people are extremely bouyant due to the salt in the water, and the water is very shallow inside the reef.

Enjoy your birthday, there is no shortage of excellent restaurants on the island to celebrate in!

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