Since I am a magical pine marten (not to be confused with a certain underwater prehistoric animal), I would probably build a gigantic tower, and start shooting fire balls at people I don't like. Once I got bored of that, I would spread joy and happiness, and generally cause people to laugh. Eventually, I would lock myself up in the tower and never come out, and then send out several rocket launchers with a golden ticket inside for someone to find....(goes on rambling)
Basically, I'd be happy with myself, though showers, public pools, sex, and many other things would be....somewhat impaired in my case.