As someone who has yet to watch One Piece, I would love for the treasure to be Friendship or some very Jump-shounen-series thing like that.
Then you are missing out on a grand adventure as One piece isn't about the destintion but the adventure to get there!
I'm currently in the process of watching After War Gundam X, well a rewatch after along time and honestly, I gotten further in than I did on the most resent Gundam series as that one was just a mess, some good ideas but bad execution on top of having the show reduced to one core instead of two or more!