I spent a day birding around Siletz Bay (Birding Oregon chapter 37). This part of the coast is not one of the more scenic areas, but there are a couple spots tucked away that are worth a look.
The main stop for the day was Boiler Bay State Wayside. This spot gets a lot of press as one of the best birding sites on the Oregon coast. While it is true that Boiler Bay is the most likely spot to find a lot of seabird species from shore, the birding here is not easy. On many days, you must patiently scan the ocean with a scope, hoping to find a robin-sized seabird from several hundred yards away. While bird numbers were low overall, two hours of scanning produced a nice variety of birds, including Ancient Murrelets (a nemesis bird for me), Marbled Murrelet, Horned and Western Grebes, and a Rhinoceros Auklet.
Cutler City Wetlands is a nice patch of woods worthy of exploration, especially during migration. From US 101, turn west onto SW 63rd Street. About one block from the highway, there is a small parking area on the right side of the road, just across from this sign.