Belize Dive Services is the Best. I would go to Turneff first, my favorite. They do 3 dives, 2 are wall dives and its great. You get more bang for your bucks. Then do the Blue Hole.Finding calm days are rare this time of year and the blue gets rough so decide on your prorities as if you plan for two dives in one week others may be cancelled. Everyone wants to and should do the Blue Hole so do to winter waters you may want to make that a priority,