Tough country to hunt in and ramble around in. Go prepared for any type of weather. The Trinities make their own weather due to their topography and being so near to the coast. You can get snow well into summer in the higher elevations.
Very strange country that's nothing like the Sierras. It's easy to get turned around as the terrain is so similar it's hard to find good landmarks. So, make sure you have a good map, compass and GPS if you like that.
It's also Bigfoot country with lots of sightings in those woods. Take a heavy bow along and you might even come back famous! I'd sure take a fishing pole along if you're anywhere close to the Trinity river up in the Happy Camp or Hoopa area. Good fishing in the river and there's some good swimming holes too.
Have fun and good luck!