Speaking of the Main......
If you don't pull any permits, a preseason launch on the Main is a great alternative. Just need to launch prior to June 20 - assuming the date hasn't changed the past few years.
We did it a few years back, ran 90+ miles in under 3 days - the water was moving but had peaked a week or two earlier. Hardly another group on the water, campsites of our choice.
Ran into a group that had put on around the around the daily sections by Shoup or even up higher and took out at Riggins, making for around 140 or so miles???