Scuba Ranch in Terrell. It is not the Carribean but I really enjoyed diving there this Summer, I probably had 70 dives there over the Summer. Many of the dive shops use it to certify students. There are quit a few people that will camp out over the weekends. It is a good place to work on your skills. It is full of fish, a little over 50' deep and there are quite a few attractions. It is big enough that I tried to circle it on a tank and only made it 3/4 of the way in about 85 minutes at very slow pace. In October it started getting too cold for this warm water wus. They rent tanks/ equipment and have good access places.