The Royal Garden states:
At game end, the owner of the occupied royal garden takes 1 VP for each noble on his island. As each noble is normally worth 1 VP (whether on a building, plantation or in San Juan), with the occupied royal garden each is worth 2 VPs to that player".
Puerto Rico defines "island" as the twelve spaces at the bottom of the board to place plantation tiles; the Royal Garden states that you get 1 VP for each noble on his island (which I would assume means "nobles on plantations") but then goes on to state that nobles in San Juan and buildings are worth 1 extra VP as well.
So... which is it? Do nobles on island tiles get the extra VP, or nobles on your entire board get the extra VP?