DirtyDeeds:
Thanks all for your advice! I think I have narrowed down my trip to Cozumel or Roatan. The diving seems very good at both places just not so sure about the nightlife. Anybody been to both places to compare. It looks like Roatan is cheaper.
Either place you can drink enough to put yourself at risk for DCS for the next dive.
At Cozumel there will be more places to do that with more people to do that with. The diving is, for the Caribbean, maybe a 6. You can drink non-alcoholic drinks and have a great time. Let the party happen around you.
In Roatan, there are many fewer places to drink with less people but the drinks are cheaper and there are many places on the "West End" to do this. The diving (from the West end, I would give a 7.5 in comparison. Alcohol seems to fuel the dance in Roatan more so than Coz. Once you go to a place for the night, you're pretty much so there for the duration.
Unfortunately at this stage in your dive carreer you will not see the difference in diving. That is not an insult, just plain observable fact. Your observational skills are not what they will be at dive #25 or even dive #18, much less #300. At this point, you really might be lucky to see the proverbial 45' Yellow School Bus with 4 way flashers if it were parked on the reef. Log some dives, get comfy- then worry about "what you'll see".
Roatan is best for the micro (small) stuff and the ability to see will come in time. The reef on the West end is in a Marine Reserve and your current buoyancy skills might be better suited to the easy drift of Cozumel.
The Coz dive boats are easier and simpler, and most of all the DM's see a constant stream of divers who are logging their 13th dives, etc.
Coz sounds like the place for right now, and consider re-reading that chapter about alcohol and DCS.