Recommendations for trip CA heading anywhere 5 days

Thanks for all the replies, I think we are going to start researching the Lassen, crater lake and the pin hit redwoods on the return. Hoping to be able to land spots everywhere. Kids will get bored driving all day I'll bet, not like when I used to travel for 3 week trips with the travel trailer, no tech back then just grabbed Archie comic books at every stop and passed them around the van.

Do pose everyone Pre-book each stop? I've heard sometimes you just pull up at checkin time at some places.