My birthday present to myself this year was a Trikke:

Me on my Trikke

Trikkes (that's a long "I" and just one syllable - "trike", not "trik-eee") are three-wheeled cambering vehicles, which is fancy speak for "lean side-to-side and turn the handlebars and they go fast". They are way fun to ride, but prepared to ache all over when you're done as pretty much your whole body gets into the act. Trikkes excel on the flat, slaloming down hills is a blast, and going up hills is a whole lot of work but very possible. (I'm still working on the going up hills part...) And you can freestyle on them just fine.

If you're in the Seattle area I'd be happy to give you a demo riding lesson. If you decide a Trikke is for you, please purchase through my affiliate site and help me feed my Tablet addiction! <g/>