I'm a fan of the old-school, get your butt off the couch activities. Skating is a great one. I've been going on Monday nights to skate for fitness and practice and it's half price admission - great deal at $2. Sometimes the weekends are crowded, but that's part of the fun. Facilities are nicely retro with a pleasant worn in quality.
As to the previous reviewers acidic remarks, there's no-where inside that teens could be smoking weed without being found out. The rest is up to parental supervision - so I'll assume his failings in that department, and not the failure of Kate's to provide a decent atmosphere for some fun.