Travel Washington / Grape Line offers 1 Sunnyside boarding location for your travel convenience:

Sunnyside Travel Plaza – 1825 Waneta Rd.
General Info: Advance, paid reservations not required at Sunnyside Travel Plaza. Cash purchase available with driver.
Directions: Take Exit 69 off I-82 / Hwy 12. Go north on Waneta Rd. Sunnyside Travel Plaza is on the left.
Boarding Location: Board the vehicle at the bus stop near the Sinclair Gas Station dinosaur.