As I said, "things that interest me". Social clubs, traveling, and world historical landmarks are great if that's what interests you and I'm happy for people who enjoy those sorts of things. Learning new things is one thing we can both agree on as always being worthwhile.

All that being said, the best "new thing" I can think of is finding creative ways to serve others using what I know about. My blog is one such way though there are no doubt others as well. Giving to the world is a pretty good way to beat back boredom.