Another vote for volunteering.

Visiting a retirement/assisted living center might be really rewarding or helping at the community food bank.

This might be a good time to try something you've never done before, since you will have a lot of time. Is there new craft or hobby you've always wanted to experiment with?

I would like to suggest that if you've never gone to a contra dance, they are very fun, easy to learn (no experience needed), the dancers are usually really friendly and you don't need a partner. They are relatively inexpensive ($10) and done to live music. Usually there is a 20-30 introduction for beginners before the dance starts. FYI: the Colorado dance schedule is at http://www.cfootmad.org/dances.htm

I hope that's helpful- Sharon