Well having lived here virtually all of my life, and having not been "out on the town" in a few years, I'm not real sure anymore. What I can tell you is that there is a nightlife here, although not like Vegas. You've got the usual bars to go to. There is Red Robin at the mall that I've heard goes off on occassion. If you're not so into dressing nice and just hanging in levi's and a t-shirt, you've got bars like Mable Roadhouse which is kind of a dive bar, but it is fun. There are bars scattered all over the place, I guess you just have to find one that suites you and your style. Like I said, I have not been bar hopping in a few years. Maybe 80grit can give ya more info.
As far as what to do, you've got Magic Mountain, and Hurricane Harbor here. During the summer months, at Central Park (sound ghetto, but isn't) they have free concerts in the park which are cool. Last couple of years they have gotten tribute bands to play such as, Led Zeppagain, Hotel California, Boogie Nights, Van Halen tribute band, and some more that I can't remember. There is a motorcross track that holds races that is about a 20 minute drive up the Hwy 126 towards Ventura, I've never been, but heard it is pretty cool. The way Iook at it is this..........the desert = 1 hour drive........the snow = 1 hour drive......The beach = 1 hour drive.............pretty centrally located I'd say.
Hope this helps.............. :surrender: