Can't come to Sioux Falls without going to Falls Park. Easy to get around and not far from downtown. There is a really cool farmers market on Saturday mornings if you are looking for something to do before the big event.
Awesome place for coffee and dessert! The owner won season 2 of Bravo's Top Chef: Just Desserts.
There are lots of restaurants and boutiques downtown. Some top recommendations include Blarney Stone, Fernson Brewery, and Philips Avenue Diner.