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 playground
1 volleyball court
1 horseshoe pit
Drinking fountain available at restrooms
16 acres

Other parks in Provo are listed here.

There is a cool painted tunnel under the road at the north end.