Re: thinking of doing a tri...
well... seeing as you only get one chance to do high school track and can do tris forever... you may want to consider doing the tri in the summer. However, if you really don't like track that much and are not looking for the friends, experience, college money/recruitment etc. then do the tri!!!
I do a tri every summer!! The cross training is amazing and the race itself is soo much fun. I have become hooked and hope to do 2 next year. Just make sure that you train for all three parts equally. Especially the swim. I was hoping the run and bike endurance would pull me through the swim the first year but it didn't very well, and the second year when I actually trained for it, I took minutes off my time.
So what kind of tri are you thinking about....
Good luck!!