I find it interesting that some of the people telling the OP what the diving will be like seem to have limited experience, despite their number of dives. My experiences diving around the world differ from what some people seem to think is done in
all places. Here are just a few examples:
- In Cozumel, some of the operators, notably Aldora, offer HP 120 foot tanks in order to extend dive times. First dives are usually in the 80-100 foot range, and NDL is very much a concern.
- In South Florida, most of the operators I have used do not put DMs in the water leading dives. Many of the operators offer a wide variety of tank sizes. Depths of first dives can go all the way to recreational limits--130 feet.
- I have dived with a number of operations in the Hawai'ian Islands that had us diving to the limits of both our gas and our computers.
- I just got back from diving in Bali a couple of months ago. Yes, we did mostly group guided dives, but we also did unguided shore dives where depths and times were up to us.
Does your computer make a difference on dives like that? Last year while diving in South Florida for a week with two friends, we used three different computers, and we were limited by the most conservative. As soon as that week was over and the other two went back home, the one with the most conservative computer, who had been totally frustrated during that week, sold his computer and got a different one.