Hi. I am heading to Cozumel at the end of September. We plan on doing 3 days of 2 tank dives and maybe a night (first). I got my c-card last year and have 20 dives in. Any recommended dive sites to consider? Have never done a drift dive and am looking forward to that. Any special concerns about the drift dives in Cozumel? Last question, Dive with Martin looks good to me and good reviews as well. Any negative feedback on these guys? Thanks for any thoughts.