Are you looking for an activity on a wet and dreary day? Wander around the interesting displays at Childrens Museum of Eastern Oregon. There's always an opportunity to learn something new.
You'll have sightseeing choices galore in Pendleton. Children's Museum of Eastern Oregon is a good place to begin here, but there are lots of other fine sights to appreciate. Wildhorse Casino, Roy Raley Park, and Pendleton Center for the Arts are near the museum and will round out your day nicely.