Making Boundary the night before for the campsite choosing is no big deal unless you're dead-set on particular sites (which you may not get anyway). As previous posters suggested, if you are travelling that far, camp or stay in somewhere along the way like Boise or Lowman (Pine Flat is good too). Going to Stanley, you'll be backtracking in the morning. The big thing to remember is that the water will be very boney at the top. We are launching at Boundary a couple days before you and "high boating" or "deadheading" (single oarspersons in unloaded boats) down to Indian Creek where the rest of our group will meet us. Idahoriverguide's sage advice above - allow extra time to get down the top is very true.