What Are Your Favorite Free Activities?

With all the belt-tightening that's been going on during the recession, I was surprised to learn that movie attendance has actually increased in 2009. I've heard that in tough times, people tend to favor escapist activities like movie watching and reading.

I enjoy movies too, but even if I can talk my way into the senior discount it still costs close to $10 to see a first-run movie in Portland, OR, where I live. So I'm always looking for free activities that are fun, entertaining, may help me learn something new--and don't require cash or a credit card.

I've compiled some of my favorite free activities for older adults, but I'd like to hear your ideas.

Indoors or out, what are your favorite free activities when you want to have fun, sample a new experience, or just get out of the house for a little while?