Generally, the first reef is around 75', second dive a bit shallower, about 65' at top of reef. So you can stay on top, or ease down the side or into a "hollow" where it's deeper, nearer to the sand, which is more like 80-90'. So you have pretty reefs to look at, and usually a fair amount of fish and maybe even a ray or a sea turtle or a small shark if you look around. Both reefs and current typically run northward, so you don't fight the current, you use it, and drift over a lot of ground. So, less finning just to travel, hence your air lasts longer
Yes, just stay with the crowd near the DM, they try to go at a medium speed. Jump in early-ish so you don't have to catch up. If you or new-diver wife use air a bit faster than DM, signal him/her that you're going to surface and just start ascending when you're down to about 900psi, take it slow, and hang at 15'--no rope, so it's a free ascent, but you've got enough dives to be able to do that, and if you can hover at 20 to 15 feet and then come up real slowly to zero, you wife will have confidence to do the same. Ditto with reboarding via ladder in open water, if you can do it, she can.
I'm heading over that way, will make the morning dive with them (typically they have two boats going out), on Sunday.
