I enjoy visiting California and I know how to follow the laws concerning hand guns while traveling through. I wouldn't let the current laws in California stop me from enjoying the sites and activities there. There are places in NM and all over the country that restrict gun carrying too. Go have fun, but take deadhawgs advice.
But, as you have found, California does not honor any other state's carry permits. You can have your pistol with you, but unloaded, ammo separate, locked in the trunk. Once you get to your motel or campground, you can have it loaded and ready in your room or campsite. No magazines over 10 rounds allowed though.