There is a wealth of great advice here and if you don't mind I would like to ask a question. I am going in May and unfortunately I can not dive a live aboard. I have 2 day trips booked off of Santa Cruz but I am having difficulty with Isabela. The tour company that I am going with have told me that the dive companies on this island are unsafe and thus they will not do business with them. Can anyone recommend a dive shop on Isabela? I would really like to dive Tortuga when I am there and I have to arrange this on my own. Thanks.