Information, information, information. Of course, the more actively you participate, the more fun. Most clubs have regular meetings, which include talks on herp topics and workshops. Most clubs also publish a newsletter that is part of the membership. Many clubs are into education and do reptile shows.
Some clubs hold swap meets.
You also get advice, help, and support with problem animals. You can purchase animals and know who they come from, and often you get a better price, somewhere between wholesale and retail. There are many clubs, and the list changes a lot. I don't have time to maintain such a list. There is a club list posted periodically on rec.pets.herp.