I took a similar path - violin for 9 years, then switched to guitar when I was about 16 (to be cool, of course). I didn't completely drop the violin, but guitar was my main instrument for the later part of high school. But then I picked the violin up again for All States my senior year, and kept doing it for college. Surprisingly it's violin that stuck - I still play a couple times a week, while I haven't touched my guitar in close to a year.

I've also dabbled in a bunch of other instruments - 3 years of clarinet in middle school, enough viola to play and (barely) read music, picked up a fife and tin whistle in Williamsburg, reasonably fluent on bass guitar, and I've been trying to teach myself piano over the past couple years, with only slight success.

A friend of mine was an electrical engineer and a drummer. For a senior project he made some electronic drums. Bessel functions are hard :)