I've been on the Lochsa for 5 seasons now, but haven't been there yet for Madness weekend. This will be my first!
Find a crew to join and follow their lines.
The Falls looks huge, but it's either going to flip you or it isn't. I've done dumb things (like trying to surf or spin) and gone through upright, and I've had "perfectly" straight lines punching the wall on the left and been dumptrucked. It's got a huge long pool afterward. Go for it.
Horsetail and Grim Reaper are tougher rapids, they just don't have the same roadside carnage view as the Falls.
The "Upper" from White Pine down to Wilderness Gateway (or Fish Creek) is 17 miles of more technical, gorgeous rapids. See you there!