I play vintage baseball. It's baseball using rules and equipment from the 19th century. There's nothing else in my life that connects me to my eight-year old self, but the feeling I get running out onto the field or going up to bat is exactly what it was back in Little League. It's also a really fun community of passionate baseball nerds, and a good motivation to stay fit.
I don't know of a good one, sadly. Run a search for "vintage baseball" and you'll get various amateur sites for various local leagues, with explanations of varying quality. If you're truly interested, swing by a game local to you and watch - and, ideally, follow the players to the pub after. It's all very analog, which is another reason I enjoy it.
