Things I would do on a return trip...
-The cost is so crowded and felt dirty.  I don't know that I would spend a lot of time on the cost again.  
-February has very complicated weather in California.  We dealt with a lot of flooding, rain, and snowy weather in the mountains.  
-I would stay in Mariposa, CA for sure on a return trip! 
-The Sequoia trees were spectacular!  Recommend this for everyone to see at some point. 
-We couldn't make it to Channel Islands because of the weather and wind.  This was very disappointing for us, but we will be back. We decided to explore Santa Barbara and Solvang, CA instead, but it rained the whole time. 
-Disneyland is a much easier and pleasant experience than the complicated Disney World.