Planning a motorcycle trip to find a new home in CA or OR or WA. Suggestions?

I’m planning to hop on a motorcycle and drive up the CA coast through Oregon and Washington to check out potential places to move my family. We’re looking for a relaxed town with a population of around 3–4 hundred thousands people—or within a 15 minute drive of a town that size. We’d like to be near the ocean or mountains. Does anyone have suggestions of towns to check out? I’m already planning on looking at places like Eugene and Santa Rosa. Thanks!