I opted to do the Tour de Lake loop and had fun. I didn't get 71 miles in but the 40 of that loop does give you quite a bit of elevation. Funny part is my sore knee was fine, now the other one is sore. Oh well.
glucosomine (I probably spelled that wrong). Of course, as Norm said, M&M's can cure most ills as well (at least it works for me).
Try MonaVie it works wonders on your joints, they even sell gel packs.