Unfortunately there's no diving in the Tucson area. The closest diving is at least a 2 hour drive in manmade lakes. Viz is usually 5-10 feet, in some places and at some times 15-20. You'll see some fish and vegetation, but not much else. If you're looking for something to do while your wife is in meetings, you won't find much. If you want to stay a few extra days and head down to Mexico, you could get some decent diving in there. Check out my website in my sig line for some photos and information on the diving around AZ. Just enter the site and click on the Dive Sites link.