Too much spare time during the summer, an ways to keep myself occupied?

All my friends bought a season pass to Disneyland and they've been going at least four times a week. I can't afford one so I've been home a lot. I have other friends but they party, drink, and take drugs. I'm just not into that stuff. I was thinking about running and working out, learn how to longboard, fix up my car, and I applied to a few places for a summer job. Other than that, I can't think of anything else to occupy my time. Some good ideas would be appreciated.