My wife and I are going to Cabo and considering a PADI Discovery Dive (shallow open water training and then up to two dives down to 40 feet). We both have our own real masks, fins, and snorkels we have used for snorkeling which we are comfortable with and works perfectly for us so we should be good with that equipment. My concern is the potential dangers for dives down to 40 feet. When I say dangers, I am not talking about sharks, etc. etc.. Can anyone provide any suggestions, recommendations, cautions, etc.etc. THe following is link it to the dive shop we plan to use. They have been very responsive and have very good reviews from the research I have done. This is a dive shop, not some excursion company that does a bunch of stuff and diving. Thanks! Manta SCUBA Diving, Cabo San Lucas, Sea of Cortez