I would recommend Cozumel for you next dive site, but you might be disappointed with other places afterwards. I recommend it because you are not committed for a week like you are going to/from Bonaire (flights only on the weekends). The drift dives are great, as are the night dives. Friendly folks there, too. You can read about the recommended dive shops in other threads, but if you go with one of the top four or five recommendations, you will be happy. Oh! It's also cheap to stay and eat there. I'm going back in a couple of weeks and can't wait to get in the water.