I've spent a lot of time rafting the lower salmon thru the north section of unit 13. The interspersed public land gets hit hard during the hunting season. You can access some small areas of public land from the river, either by raft, drift boat or some stretches by jet boat. I can tell you personally after having a cow elk tag this season, that you will be climbing hands and knees to get up above the river. I'm 28 and in good shape and it took me 3 days to pack out my elk, and that was all downhill (also took a little tumble with a 100 lb pack, amazed I didn't tear my ACL/MCL. thanks to the nasty rose bushes for catching my fall)
Besides steep, most of the sections along the river have very nasty rose bush thickets. After spring bear hunting in this unit my buddy and I came out empty handed, with blood dripping from our arms and our jackets/pants ruined.
The Salmon river side has less mule deer more whitetail (lots more pine/fir trees). The snake river side is more mule deer friendly, but the river is gnarly and besides Pittsburgh landing public land area, the river is the only other realistic access.
But hey if your "hardcore" like all the youtube guys, go for it. I personally don't plan on going back. Only way I see it being a reasonable hunt is for a guy with a jet boat and knowledge of that section of the river.