I did my Nitrox certification my last week in Hawaii. The Staff of Aaron`s Dive Shop were very accomadating. I was allowed to sign up and do my independent study. I did my two dives with Mel. She is awesome. We had a great dive on the Baby Barge and then had "fun" in the current on a nearby reef. I will never forget the dives. How often do you get to see a baby octopus. I finished up my class work and test the monday after the dive. It was great to have the one on one instruction with Mark. It really made the difference for me. I like their flexibility as far as schedule and dive locations. They have the ability to dive anywhere around the island. If you heard of some specific dive site, they will take you there. It definitely helped to make my Hawaii trip, a great one!