I hiked into the wilderness section along Granite creek on July 4th. Wilderness section was fun and about as beautiful as it gets. The hike took our crew the better part of the day and is probably only worth doing once. We passed over 100 bear prints from both black and grizzlies but we somehow didn't see any. For the suffering involved in the 6+ mile hike I wouldn't want the whitewater any lower... but if you are set on camping it might still be worth it.
Putting in at Bear creek as soon as the middle fork hits highway 2 offers a short II-III stretch which was fun on the 5th and we got up close and personal with some mountain goats at the lick. We took out at the essex bridge but I bet you could keep floating all the way down to Glacier for ~40 mile float, which would also pick up the other standard whitewater stretch mentioned by vardaddy. I think this is mostly flatwater, and sees quite a bit of traffic. I'm also not sure about the legality of camping in this area. I saw lots of big coolers on the rafts but not much in the way of overnight gear.
The sunshine walked beside her