Lots of good suggestions so far. I would say that as a single hander, one of the best things you can practice is heaving-to. Many tasks can be executed from this position..even if it's just to take a break to eat a sandwich.
For a quick break, my boat is stable on a point between a close and a broad reach with the jib eased to the point of luffing on a close reach. With the wheel locked, the boat will head up, fall off, head up, fall off, without having to back the jib as in heaving-to.