It would be fun to ride a horse. I've always wanted to ride one, but I've never made the time. They're like big dogs you can ride on, what could be more fun?
I'd like very much to build a home for myself with my own two hands. I've had the dream since I was a little boy, but kinda got sidetracked. My house now is fine, but I have to admit the prospect of designing and building a real, honest to goodness home for myself is incredibly tempting. Now that I'm older, I also want to make it energy efficient, perhaps even independent. Still, it would take quite a bit of architectural know-how and a good grasp of electrical engineering. Not impossible, but by no means a simple dream.
Oh, I'd very much like to visit space, too. My hope is that private space shuttles will be affordable in my lifetime, otherwise this one seems out of my hands. Space tourism is an industry I'd like to support.