If you're a fan of live theater performances, go and see a play at Power House Theatre. Check online to see what's still available.
You'll soon learn why this Walla Walla arts and culture attraction is visited by many travelers. If you're looking for other things to keep you busy, Whitman College, Art Gallery at the Marcus Whitman Hotel & Conference Center, and Downtown Farmers Market are in the area as well. They won't take long to reach from Gesa Power House Theatre.