We got one day on the Yellowstone and it was great - the maiden voyage of the new raft. We're going to NW Wyoming for our multi day and doing 2 days on the Shoshone and 3 days on the Snake. Not really multi days as we're staying in our trailer and shuttling, but it will be multiple days on the river! Can't wait.
If you lean over to watch the river slipping slowly away beneath you, you will suddenly know everything there is to be known. Winnie the Pooh