Page 3, Super Mario Sunshine Cheats for GameCube
Contrary to popular belief, defeating Bowser is not required to re-access the airstrip.
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All you need is access to Corona Mountain. Once there, pause and hit "Exit Level".
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And voila! The flood will vanish, and the ferry to the airstrip will run...and you didn't even beat Corona Mountain.
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.
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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.
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If you fall off, you will not only have to start over, but you will lose a life.