Arrrrr!
Arrr Matey, this and a bottle of rum!
This game is nice, it's short enough to just play a around a bit, the grafics and the theme are very nice, the gameflow and the levels are awesome. I never played a Golf-game with a storyline before.
Anyway, I think you made a mistake with the medals. Both the Explorer and the Treasure medal are described as 'collect all coins'. I guess one is meant to be the secret room, like in the game.
And now I am off to find the room, get better and save that damn croco! ARRR!