Wow that spot on Skookum looks amazing! I wouldn't mind goin there to just for the hike! I have explored Skookum before with no panning equipment just to get into the steep areas to check out and there are some really cool spots but I never tested the gravels. I did see what looked like several bear poop piles alomg the way though and also followed a deer trail down which kicked my butt on the way back up. It was eastward maybe half a mile past the big hill on the right when looking east standing on the bridge at the beginning. I found a really nice bend with some flat spots and a huge boulder but like I said didn't take my panning stuff as I was just in it for exploring/hiking but would like to check out that ladder area! As for the canyon on the SF yes its a couple miles in but there are 3 different trails which have taken me to the upstream end, middle, and downstream end of the canyon. The 70+ foot rope is at the southend trail ( I hope nobody, as in the person who set up the area, gets mad at me for sharing because its not my rope/discovered area and it gets very very few visitors ) and it is really fun I bought my brother a small belaying handle so we could practice going down ropes and it was tons of fun as it felt pretty dang safe! He only slipped and smacked into the side once but it isn't a 90 degree drop anyway so not too bad haha. For the other trails into the canyon, the northend trail gets you to the pools right before it starts flattening out to gravels bars, I found this trail by the crasiest experience atleast to me, I was exploring the area again last summer and out of the thick brush come out 3 cute girls all wearing swimgear and I was like hmmm ok so this is a dream, this place is enchanted, or theres some super cool place that way! So I asked them and they told me bout the swimmin holes so I went down and could not believe they hiked all that way but there is a nice spot climb down a rope 10 feet or so which looks like people just go to hang out and jump in the pools. From that point you can access the center of the canyon by walking along the walls or a very steep trail which sounds kind of like you are saying of sliding down your butt haha. The only spot I haven,t been able to get around is right in the center of the canyon the cliff protrudes into the river and its extremely steep, 90 degree, and the river is deep right there so I have never been able to get around it or come downstream of it from the south end of the canyon due to massive rocks/difficult terrain but maybe next august/september when the water is low I will keep trying as I just want to say I was able to explore the whole canyon haha. In the center of the canyon there is a massive rock someone has taken a dredge or something up there as it has 3 feet of material missing around it and they left some of their equipment/big hose up there hidden but I tripped over it exploring the surrounding mossy area. Wow this was a long post! Haha