look out for upper little d
lower little D should be no problem to get into, leave it to the experienced rafters for the details but I do remeber you have to get up early to sign up with the ranger as it is usually the first requested.
From experience look out for the gegaws who end up with upper little D to make sure they don't "mistakenly" float past the upper sliver of a campground.
Surf it up, I am jeleous.
Its called a Lurk. Its what the old Norwegians used before we cut em up into two pieces