I'll 2nd the "follow the PCH as far north as you can, you will will not be disappointed" comment. We did a 8,621 mile RT from Louisville, KY to Seattle WA earlier this summer and already making plans to go back.
If you make it to the Giant Redwoods area; halfway between the Redwoods and Eureka CA is a RV campground called Elk Country RV Resort. Sure isn't a resort but good WIFI. Sites are basically in a field but there is a huge Elk herd that frequents the park. Back in 2006 wife and I were driving down 101 and we looked over and there in the park were close to 150 ELk. We didn't have our RV with us at the time but I said if we ever came through that area again with it I would sure stop and spend the night. We did but the Elk didn't enter the park that night, they did 2 days before according to 1 lady. However I did spot 5 Elk across the road right at dark.
We took 101 all the way up to Newport and then over to Portland. Beautiful country.