I own that this probably won't be a popular idea, since it generally doesn't appeal to people outside a certain age-group (not that I know what age group you're in), but a longboard sounds like a pretty good option for you, depending on the situation. It's easy to carry around wherever you go, I often ride to a bus-stop and take the bus with it. They're lots of fun to ride, and in my opinion better and safer then bikes (it's a lot easier to bail). The only real reason I would be questionable about riding is if you're in a hilly area; uphill is about as much fun as it is on a bike, though you can just get off and walk, and downhill can be dicey depending.

If you wanna check out some nice cruising boards I've been loving my Kahuna, and they come at a really good price for what they are.