B.W.
Look into some ECFE programs in your area. They usually have programs for kids 18 mos up, although you may be required to go with her. Next summer she could go alone! My daughter went last summer when she was 3.5 to an ECFE summer program it was her first time in a school/ social setting with other kids. she loved it, I loved it and she still talks about her "old" school even though she started another preschool program this year.
There is a really cool amusment/water park in Taylor's Falls that has a great kiddie area. It's about an hour away from the cities?
There is a really nice man made beach in Maple Grove. There is also Chutes n Ladders I think its called in Bloomington? Edinburough in Edina? check out this website it lists parks and activities across the state.
http://www.threeriversparks.org/