Forgot to add from my childhood memories of traveling from Seattle to Portland. It was an all day trip on old Highway 99. Now you can make the roundtrip in one day, if you start south of Seattle!!
Also the camping trip from Seattle to Denver and down through the southwest and back. All 2 lane roads but still remember not only the national parks we visited (which we have redone in the motor home) but also the Jack Rabbit Trading Post; Tepee Motel and the dinosaurs around Holbrook AZ.!!
I'm sure that trip is what whetted my travel and wanderlust as well.