Hello longhaulers 
My DH has a milestone birthday next year and we are planning a once in a life timetime type trip. Thinking a west USA road trip at the moment but I have no clue where to start.
We know we would like to do Los Angeles, San Fransisco, Vegas and the Grand Canyon but I’d really love some ideas for experiences/places that other people have been and loved. Perhaps a national park or lake or two?
I’m pushing for a month long trip but DH doesn’t think he could get longer than 3 weeks off. Re timing, from my initial research I’m thinking either May/June or September (hoping The former so it’s sooner!)
Has anybody done this and could perhaps share some wisdom or tips? Looking for anything helpful from best month to go, to places to visit, to whether to fly/drive or get an RV. Treat me as a total novice to this road trip lark 
Thanks in advance!