My quick thoughts on a northern California honeymoon in the autumn (fall) for a fun loving active botanist.
“Sounds like an awesome trip!
Avenue of the Giants is great, as is pretty much all of the “lost coast“. If you’re going up via highway 1 or fancy a side trip from 101 then Mendocino is very nice and has a typical NorCal beach with some amazing seaweed!
I also love Yosemite. One of my favorite places is Tuolumne Meadows but I’m not sure if Tioga Road is still open. I hear it was snowing there already. Get your jumpers ready. Even if you only get to the Valley it’s still pretty epic.
After that I’d recommend Bodie and Mammoth Lakes to the east of Yosemite before hitting Kings Canyon, Death Valley then Vegas.
I hope you have an amazing trip. The places you are visiting are some of my favorite places ever so I’m sure you will.”
Cheat-sheet where to stay:
Yosemite – Tuolumme Meadows campground
Kings Canyon – grab a permit and camp offroad in the many backcountry campgrounds
Vegas – The Wynn