This has become a fun and easy little annual trip for us. Sioux Falls is an easy hour drive and the Sioux Falls Zoo is all flat and only takes a couple of hours to see it all. The kids enjoy seeing the animals and it's not too much for them to walk. We packed a lunch and ate at Falls Park - we always spend a little time playing at the "beach" and putting our toes in the water. Maybe one day we'll be brave enough to try the Omaha Zoo??