From Provo‘s Website:
Exchange Park is a long park that follows the Provo River and the Provo River Parkway Trail. Relax and enjoy the sounds of the river while enjoying a picnic with your family and then go on a leisurely walk along the trail.
The park has:
60 parking lot spaces
1 volleyball court
1 horseshoe pit
Drinking fountain available at restrooms
Other parks in Provo are listed here.
There is a cool painted tunnel under the road at the north end.