Roll up! Roll up! If you're a big kid at heart, head for Utah State Fairpark. See if an event or fair is being held during your time here.
You'll need to pay an entrance fee to visit this outdoor exhibition area in the urban neighborhood of Fairpark, so look up the cost before you go. If you're eager for more fun things to do and see after your visit to Utah State Fairpark, The Gateway, Salt Lake Temple and Tabernacle are nearby.