The Yakima Valley [1] farming country makes for great back-roads cycling, with a multitude of possible loop trips. Get a map of local cycling routes from the visitors center. Unfortunately, there are absolutely no bicycle rental shops in the Yakima Valley, Tri-Cities, or Walla Walla Valley areas. Pick up a rental on the way. If you are headed over via I-90, stop off at Cle Elum Bike and Board (316 W. 1st St., 509/674-4567). Or try one of the numerous rental shops in the Gorge if you are coming in from parts south.
If you need some supplies or want to buy a new ride, Jake’s Bike Shop (507 W. Nob Hill Blvd., 509/469-9602) is a friendly local bike store that does right by its customers.
Links:
[1] http://www.moon.com/destinations/washington/columbia-gorge-and-wine-country/yakima-valley