There are a few taller ledges along the boardwalk/seawall, and some random hills to bomb. I'm sure there's more than that, but I never skated there much so I can't say. You could get up to Mission Beach/Pacific Beach fairly easily and hit up some of the spots from the old Zero videos. There's a park roughly in OB, which last I knew is now open and free, but usually overrun by bikers. Washington St is probably more realistically a bus ride away, albeit a short one. You can use sdcommute.com to figure out which bus you'd need. Washington St is under the bridge at the intersection of the PCH (Pacific Coast Highway), and obviously Washington St.