Depending on the dive site(s), your wife could come with you and snorkel. We had a great day with Protech at Hol Chan / Shark and Ray Alley, where I snorkeled while the rest of the boat dove/[dived?]. I waited through their first dive outside the reef, and got pretty queasy -- take dramamine!! (I hadn't thought we'd be outside the reef.) But after that we headed back inside the reef and we all snorkeled awhile, then I snorked while they had their second dive. It was one of the most beautiful days I've ever had.