Out of the all wildlife refuges I've been to in northern California, Modoc National Wildlife Refuge is my personal favorite. This gorgeous spot in remote Alturas has 360 degree views and hardly anyone around to distract you from getting your nature vibes.
From the auto tour route, you can blindly stick your camera out the window, snap a photo and it's guaranteed to be amazing! I literally did that very thing, and when I went through my photos after we came back home, I couldn't figure out which photo it was.
Tricolored Blackbird
There is a paved walking trail, viewing blind, and the Visitor Center is shiny and new after being completely rebuilt after a fire in 2015. The staff is very friendly and helpful.