How many activity do you enroll for your pre schooler?

I had only signed my daughter up for swimming lessons with Little Splashes ($40/lesson) when she was younger. I do not believe in sending her to multiple lessons so young so unless she has express any sort of interest, I don't see any need for it. I let her join activities instead with my neighbours' kids or relatives of her age to expose her to different sports to see if she will take any sort of interest on it.