From the Super Mario Wiki
Tropical Refresher, or Sparkling Waters-2, is the second course of Sparkling Waters in New Super Mario Bros. U. It is unlocked via completion of Waterspout Beach, and its own completion unlocks a green Toad House and Giant Skewer Tower.
The level begins on a beach area with some wooded platforms and a Warp Pipe leading underwater. Multiple red Warp Pipes are found, along with a yellow Warp Pipe that can be pushed to cause coins to appear. Big Cheep Cheeps are found, along with a ? Block. A Blooper is found, along with more Big Cheep Cheeps. Some moving Warp Pipes are found, with an Urchin in between them. More Big Cheep Cheeps, a Blooper, and yellow Warp Pipes that can be pushed. A pit with a current leading into it is found, and Big Urchins, Urchins, Big Cheep Cheeps, and Cheep Cheeps are in the areas above. Before the Checkpoint Flag, another group of Big Cheep Cheeps. Another pit with a current is found, surrounded by Warp Pipes and Big Cheep Cheeps. More Big Urchins are found, one of which is above a Warp Pipe. The Warp Pipe leads to a ? Block containing a Super Star, two Urchins, and a Big Urchin. A line of Big Urchins is found in the main area. In an area with an incline, Big Cheep Cheeps and Bloopers are encountered, with a Spiny Cheep Cheep near the top. A Blooper is found at the top next to a Warp Pipe, which leads above the water and to the Warp Pipe.
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