Mo4wd is a local club along with Midwest Jeep Thing (open to everyone). There are a couple other small clubs, but most Jeep related. On Sundays at St. Charles Convention Center there is an Autocross Club that gets together. They set-up a course, and do timed laps.
As mentioned above,
Pappy's is the best bbq place in St. Louis. You need to get there early because they only make a certain amount of meat per day. You can also go to
Sugarfire, and
Hendricks bbq.
As far as Sunset Hills goes. There isn't anything there with the exception of Helen Fitzgerald's. They have average food, and happy hour specials. There's also a place called
Mile 277 that has pretty good food, drink specials, and nightly entertainment.
Depending on you sons age will determine a lot. St. Louis has a ton of good Craft Breweries. About 5 minutes north of Sunset Hills on Lindbergh is
Kirkwood Station Brewing, and they have good food. There are also some other good places to eat in Kirkwood. You can park next to Kirkwood Station for free, and walk around the downtown area.