As part of our "National Park Summer" we spent a day on the Green River, it was a super day to be on the river and totally family friendly. Because it was so late in the season the rapids weren't crazy big (much to the disappointment of my husband) which made it perfect for families with smaller children. Half way we stopped at a beach for lunch prepared by the guides--simple, but tasty. The scenery was fantastic and the Indian rock art panels were really cool.
Oars/Hatch River Expeditions
Address: 221 N. 400 E. Vernal, UT
Cost: Varies depending on trip you choose
Options: We chose a day trip, but there are 3-6 day trips available.