I live in Oregon and have spent a lot of time on the coast. Most are right when they speak of reservations but during the week, you will have pretty good luck if you hit the campground early to catch a cancelation. There are federal and county parks too. Some of the rv parks like the Port of Newport offer good views of the marina, bay, bridge, etc. and has a city shuttle bus that picks you up on the half hour and takes you to the waterfront and free tour of the town. Just start with your plans right now. Have a great time.