We do a music class on Saturdays and a MyGym session sometime during the week (either DH takes her Tuesday mornings or one of us take her Saturdays). She goes to Montessori daycare & they do music enrichment one day a week there.
We also do things at the library, zoo, MyGym free play, etc.
The only thing I am looking to add at some point is swim lessons.
I drag her along to the older kids activities She sort of participates in cross country with them. When my youngest was younger we did library groups, nature classes, dance or music, gymnastics, stuff like that. It was more for me than her and broke up the day a little. With my 3rd, I'm all f* it and she does nothing, lol.
DS is 3 and he's in daycare full time. He also does a 'dance' class every Thursday at school. It's not really dance per se, but movement? I don't know, but he loves it!