At the top of the Eagle Bahn Gondola (Lionshead), Adventure Ridge is the center of family fun. Obviously it’s all about snow in winter, which can mean tubing ($45 per three runs), kids' snowmobiling ($25 per person) and ski biking ($95 tours, ages 10 and up). Hours for each activity are sometimes different, so check ahead of time.
Also here is the new 3400ft Forest Coaster ($25 per ride) and the Nature Discovery Center, the latter of which offers free snowshoe tours daily at 2pm and 5:30pm (ages 10 and up). If you don't have a skiing lift ticket, you'll need to buy a scenic lift ticket (adult/child $36/18) to get here.