I love this group- we do all sorts of fun things around the area like meet for museum trips, go to local parks, etc. Most things are free. Sometimes we plan events at each other homes like cookouts, theme parties (we recently had a "messy party" where the kids played in pudding, etc.)
Everyone is really nice and it's free for 30 days and then she asks that you pay $12/yr to help with supplies, etc for parties and maintaining the online boards:
http://alternaparent.meetup.com/86/
-Amanda
PS- Most of the kids in the group are babies/toddlers, so events are geared toward the younger ones. We do have a couple of "older" kids in the 6-7 yr range too.