I would stick to Bas at VIP. He is a great guy and they will show you the good stuff. They have a top notch dive operation and if you are only there for a week and its your first time, there is so much to see just from shore. You go north or south and its completely different diving. If you can head to the East coast, it does not get any better than that. We were just there for the 3rd time in March, and when we dove the east coast, we seen over 100 tarpon, 12 spotted eagle rays and a lot of turtles. It does not get better than that. We had 3 spotted eagle rays in formation that came 20 feet from us. Its not always calm enough to dive east coast but they will let you know if its fit or not. If you like tarpon, do a night dive at Buddy Dive. That's really cool.
One other thing is, the last day you can't dive before you fly, we do the snorkel trip on the WOODWIND. They take you to Klien and the water is so clear and you see all kinds of everything. Dee is always on the boat and she is AWESOME!!!!