I've found two great ways to become a kid again (rumors that I haven't really grown up yet anyway are malicious and false

):
The first is going to games in stadiums where I've never been before - that always brings back the feeling that everything is new and wondrous.
The second is going to minor league games, where the hot dogs cost a buck, the seats are made of wood and everything is just a bit less serious...
By the way, I also grew up going to Fenway a couple times every season... A kindred spirit!