We were there on business a while back. There's plenty of recreation level stuff but I didn't see anywhere doing deeper technical diving and you will not find much GUE activity I don't think.
We dived with these guys:
Extremedive and while the diving was not the best in the world they were a friendly outfit and spoke English. The rental kit was adequate for the dives (about 15m, one reef one small wreck). The Atlantic surf made the RIB ride worth the trip without any diving!!
Chris