Cheep Cheep Lagoon
From the Super Mario Wiki
 Course layout
The course takes place at a lagoon. The track mostly takes place underwater; where the player can do tricks and get Coins and Item Boxes from the Clampies that appear throughout the underwater portion of the track. After the main underwater area, the player goes through a cave; which has another body of water to dive through or with the option to fly over it using the glider, avoiding stalactites as obstacles. There is a glider trick, hit the boosts without activating the underwater mechanics.
The player can stay on the rock on the right of the track as far as the Clampies zone. Also, racers can cut through the grass at the last turn.
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