Grab some pamphlets or brochures at Washington State Apple Commission Visitors Center. This place has all the information you need to get the most out of your visit to the area.
You're spoiled for sightseeing choice when staying in Sunnyslope. Washington State Apple Commission Visitors Center is a great place to start here, but there are loads of other worthy places to consider. Pybus Public Market, Riverfront Park and Walla Walla Point Park are not far from the tourist information center and will round out your day nicely.