We signed up online with "Raft the Rogue" out of Shady Cove. Upon arrival they signed us up, gave us a dry bag to stash our stuff, a cooler full of ice for our drinks and fitted us with life jackets. Off they took us in an air conditioned van to just below the Lost Creek Dam and send us on our way in our raft with instructions to "stay to the left of islands".
3 hours of newbie rafting fun. Screw ups were no big deal as the rapids are mild. We found they had also given us (and everyone on the river had them) two water shooters. What a great way to interact with the other rafters on the river and keep cool at the same time.
DO IT! BIG FUN!