We haven't been to any National Parks on the west coast, but here in Maine we have Acadia National Park which is the second most visited National Park in the USA. We make the trip there every year and we always find something new every time.
skipnchar and I agree on the number of 20 perhaps but we might not agree on the Parks. But, on the other hand, we might!
We lived in Estes Park '95-'03 so Rocky holds a special place for us but there are so many great NP's here in the 11 western states we have RV'd for the last 15 years that it is hard to choose. Yes, we like some more than others - but it is a matter of personal opinion and, like belly buttons, everyone has an opinion.
My thought is to decide what you are looking for in a NP of all the things available - then you can choose. And some of the National Monuments are outstanding as well.
Visiting NP's and NM's is one of the great reasons we love to RV.
Only downside is that, in general, you cannot walk your dogs in them. But some, like walking the Grand Canyon South Rim rim walk, you can to do so some extent other than parking lots and roads. Don't get me wrong, I support the ruling for the very most part - just try and explain that to your dog!
You like the way I did not commit myself? :-)
Enjoy and be safe.
DW of 50 great years, Barbara
2nd Best Friend-"Aussie" Terrier, Sadie
2006 Mobile Suites 32TK3
2006.5 Chev 3500 3LT XCab 4x4 Dmax Allie
Anytime we are just sitting around wondering what to do for a quick trip to get out of town we head up 395 on the east side of the Sierra Nevada to Tahoe. On the way, there is always a side trip into Death Valley if desired. That drive up 395 between mountain ranges is great. Also check out the old ghost town of Bodie. From Tahoe go north up through Truckee picking up route 89 and follow it over to Sierraville. Take route 49 there over to Downieville and continue on 49 all the way south down near the western foothills of the Sierra Nevada. The California Gold Country route. Nevada City, Grass Valley, Angels Camp, Sonora -- all the way down to Oakhurst. At the southern end of this Gold Country you could duck into Yosememity Park if desired. Enter on the northwest side and come back out at the south entrance. They cut 150 miles west acros the state over to Salanis and Monterey. Check out the 17 mile drive at Pebble Beach and of course Carmel. The Big Sur drive is right there. Head on home down through Big Sur. Check out Hearst Castle at the south end. From there maybe the wine country around Paso Robles. Or continue on down the coast to Santa Barbara. You could be gone two months on that loop if desired. I've barely touched the high points. That's why we never get tired of that loop.