People can hike up from the camp ground all the way to the top of Kirshbaum rapid. There's usually a raft ferry that takes spectators over to river right where they can hike up to Tunnel. I'm sure you can hike up even further but extraction from such distances becomes problematic and time consuming.
Most spectators that hike up will position themselves somewhere between Kirshbaum and tunnel.
On the river, I can abandon who I am and what I've done. However brief it lasts, while on the river I am nothing important and everything insignificant. I am flotsam, and happy to be so.