My husband is too, it is very very common and very very treatable! It is not really a disease, just a warning. Dr. Oz has a really good article on his site:

I?m Pre-Diabetic. Now What? | The Dr. Oz Show

I would join something like Curves or an easy health group like that (hiking or bird watching club?) maybe convince a friend to take up walking in 5K's for charity? Get an active hobby of some kind, even "Mall Walking" where you can both help your health and meet people?