Secret Sunshrine: Go behind the lighthouse(entrance to the beach) and jump on the platforms using fludd. On the last platform, there should be a warp pipe.
Jump in it and there will be some kind of small game. Dodge the holes, and at the end, balance on a thin plank and go to the shrine.
If you fall off, you will not only have to start over, but you will lose a life.
More tricks, tips and cheats for this game are right here - Super Mario Sunshine cheats
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