There are many great places to watch for whales on the Oregon Coast. Key factors that help are having a high vantage point and, better yet, being on one of the headlands that jut out into the ocean and put you closer to the action. Bring a good set of binoculars. A great place is Yaquina Head State Natural area to the south of Depoe Bay, just north of Newport. You can camp at South Beach State Park just south of the bridge over the Yaquina River. It is open year round. Yaquina Head juts out into the ocean which is why they put a light house on it. Great whale watching near the lighthouse. There are also great tide pools on the south side of the headland. Best conditions are for it not to be too windy. When the wind whips up the whitecaps and spray, it makes it difficult to see them spout as they come up for air. Once they do, they typically come up for 3 - 4 breaths before taking a deep dive that reveals their tails. There are resident whales that spend the entire year off the coast and do not migrate. Once you get down to the coast the tourist info centers, as well as many of the state parks, will have a brochure on good places for whale watching.
Between Yaquina Head and Depoe Bay you will find Otter Rock, another good spot. Close by to Otter Rock is Beverly Beach State Park. Not sure whether Beverly Beach State Park is open year round so check out the Oregon State Parks website. Tells you everything you'll need to know including how to get reservations. However, this time of year you don't need them at many of the parks unless you want a full hook up. You can usually just show up and get a partial hookup without any reservations or simply a dry camp site. However, don't try this in the summer. Reservations required and it can be a zoo. In addition to our FWC, we also own a '71 Airstream and one of the reasons we got it was to partake of the beautiful Oregon Coast in the winter months when it's not as crowded. Gives us a bit more inside room compared to the FWC when were parked in one spot for 3 - 4 days and the squalls come up.
Good Luck