I've not been there personally but have fished Ascension Bay in the Yucatan a bit further up the coast. You will be there during prime time for Bonefish, Permit and Tarpon plus all the other reef dwellers so I would go armed to the teeth
The guides up an A' Bay love pink charlies and I saw a lot of swimming crabs in the water up there.
Let us know how you get on.
Anyone else have any first hand experience?