I put swimming lessons in a different category than other activities, because being able to swim can save you from drowning. (Whether 2 is the right age for your kid, I don't know. But I'd like to see all kids get them at some point. I got them in elementary school, during the school day, and I think that was a fantastic use of tax dollars and school time.)

My wife and I were not big activity pushers. Besides the swimming lessons that I insisted on for safety reasons, our kid did some gymnastics, and some music lessons. Didn't really like either, and we let her stop doing both.