...only certified to go 30 ft. What card is that? Ok you are still working on your OW card that limits you to 60 ft, but many don't adhere to that either.
Based on electrix's remarks, go to Terrell. Bad things can happen to newbies who screw up, I survived mine but not all do, and the thot of you guys dropping deeper than you intended, not being able to see any guages or up, etc - gives me shivers.
Cozumel would be a good trip to plan but it's not my idea of an easy site for newbies. Many do go there, most survive, but Clear Springs sounds like a good idea. When I was new, I went to Key Largo to dive the newbie reefs, but I have since discovered ways to screw up in many locations.
Anyway, do make sure all involved have DAN dive insurance, not the cheapest level, and hire a private DM for your first day of diving - something I wish we had done back then, and additionally a good idea for your first ocean dives.