If museums are on your list of things to see in Seaside, then you might want to head to Seaside Aquarium. Hotels.com travelers also say the area is walkable and has lots of nice beaches. If you want to see more of the museums in Seaside, you can easily walk to Seaside Museum and Historical Society.
Why not spend a lazy afternoon at Seaside Beach during your trip to Seaside? Stroll along the seaside or visit the shops in the area.