Dive Puerto Rico if one day and no Isle Mona

I have a meeting I'm attending for work in Puerto Rico and only have one day free to dive. Are their any worthwhile locations, considering the short amount of time that I have? Maybe Desecheo Island? I also saw something about mantis shrimp on one site that seemed intriguing. Any good macro life there? Any dive operations you would suggest?

Cheers,

S

I dove Culebra and Desecho Islands on one day trips. Both good Caribbean dives. There is a dive site on the south west side of the island I can't remember the name of. Didn't dive it but it suppose to be nice. Palagra or something like that. All these sites are a ways from San Juan.