You didn't say what route you are planning other than "the coast". Stay off Hwy 1 north of San Francisco, not for a large rig. The 101 in Oregon can be very slow, you go through every town, which has it's perks. Oregon state parks are great, just make sure you can fit. CA has a lot of parks right on the water but few have hookups. Around Santa Barbara there are several state parks right on the water, down in Ventura is Emma Wood State Beach, no hookups but million dollar views. Stay out of Los Angeles with your rig, use your toad. There's a Dockweiler rv park in Playa Del Rey (not the state beach) that has hookups and is on the water.