Diving around Mukul Resort

We are considering a trip to the new Mukul Resort in December. Although the resort looks lovely, my husband is an avid scuba diver and would be disappointed if there wasn't any diving. The Mukul website says that they have a spot at Guacalito Beach, but that is about it. Is there any decent diving around there that he can get excited about? Do they only have that one dive location? Thanks for your help!