Electric bike? Motor scooter? Motorcycle?

Where I'm currently living in Austin, nothing I need is particularly close. So, if I need groceries, or a dry cleaner, or a box of junior mints, I have to drive a bit. It's beginning to strike me as fairly stupid to do all of this in a car that's about four times the size it needs to be to hold me and a soiled shirt. Furthermore, parking in Austin is often a pain in the butt. It got me thinking...

I've listed the three most obvious alternatives in the headline of the post. Anybody have experience with any of these modes of transport? (I'd keep the car, of course, but I'm thinking about some other, smaller, more efficient means of transport for my routine errands.)