What Do Little Boys Do?

I’m signing the girls up for fall activities.  Just one apiece so I don’t have to be a taxi.  There are all kinds of activities for girls:  gymnastics, figure skating, dance,...What do little boys do?  I thought about some sort of martial arts, but is that something 5 year olds can do?  He’s not interested in gymnastics, figure skating, or dance, and he isn’t ready for hockey.

My first thought was to look back at what Owen did when he was a kid, but I don’t think riding dirt bikes in the desert is an option in West Bend.  He did build a working pair of walkie talkies out of Legos (seriously!), but I’m hoping to get The Boy out of the house and with other kids for awhile. 

So what is it that little boys do for fun?  Were you a little boy at one time?  What did you do?  What did you wish you could do?