World 3-1 (New Super Mario Bros. 2)
From the Super Mario Wiki
World 3-1 is the first level of World 3 in New Super Mario Bros. 2. The level is mainly made up of hills of sand. Cheep Cheeps that jump out of the water first appear here. This is the only beach-themed level on the main path of World 3 that doesn't take place underwater.
The player begins on an orange platform at a beach. A ? Block containing a Super Leaf can be found here. Floating Barrels follow, which sinks when Mario is on it for too long. A Gold Ring appears here, which make coins follow behind Cheep Cheeps. More Cheep Cheeps follow, along with several more barrels. A row of Brick Blocks can then be found, one of them containing a ? Switch which makes coins to be released from a green Warp Pipe above. Another is a multi-coin block. Another hill of sand follows, along with the checkpoint. Rotating platforms and Piranha Plants begin to appear. Another Gold Ring can be found on several orange platforms, along with more jumping Cheep Cheeps. After that, two ? Blocks appear, one of them having a Super Leaf. Following that is another set of rotating platforms with a Piranha Plant on one of them. A Coin Roulette Block can be found above a pipe with a Piranha Plant in it. One last Gold Ring appears, with more Cheep Cheeps along the way. Finally, a green Warp Pipe leads out of the area. In the last area, there are stone platforms and several more Cheep Cheeps which can help Mario reach the top of the flagpole not far away.