Pacific City, OR -
Los Caporales Mexican Restaurant. Here is a
review link. I like their beef enchiladas.
Neskowin, OR -
Cafe on Hawk Creek (aka: Hawk Creek Cafe) It's a restaurant. Located about a mile north of
Neskowin Creek RV Resort. A bit pricey, but well worth it. The food is excellent. Their pizzas are awesome.
Lincoln City, OR -
Aces Sports Bar & Grill overlooks the golf course at Chinook Winds Casino. Excellent burgers, fries, tots, and beer.
Lincoln City, OR -
The Beach Dog Cafe Their breakfast is excellent. I've never had lunch their - which consists of fancy-fied hotdogs and sausages.
23 miles east of Lincoln City, Oregon - on OR-18 in Grand Ronde, OR - is
Spirit Mountain Casino. It has a very large RV parking lot with shuttle bus service to the casino. Their
Cedar Plank Buffet is awesome.
Edit - did not see the "I-5" inquiry. I'm not a fan of anything along I-5, in WA or OR. I'll settle for whatever big box store parking lot along the interstate that I can get in and out of easily that has a reasonable walk to a Subway, Dennys, local diner, Sharis, etc. I'm not looking to unhook and drive around town.