One of your first stops should be Seaside Visitors Bureau. Here, you'll be able to find your bearings and get some great ideas before you set out exploring.
This Seaside tourist information center is an interesting spot to start your day of sightseeing. There's lots to experience nearby, including Ecola State Park, Seaside Aquarium, and Tillamook Head. Take your time at Seaside Visitors Bureau before making tracks to these other fine sights.