New Super Mario Bros.: 6-2

It's back to the beach! The place is crawling with Spinies and the water periodically rises, so the Spinies will curl up and bob at the water's surface. There are Red Coins to collect here. Over one of the palm trees is an invisible block with a vine that takes you to a P-Switch. Hitting it makes silver coins and turns the coins into blocks so we can run across them. Hop over the flying item blocks for the 1st Star Coin. The first green pipe is a cannon to Coin Heaven. Here, you'll find tons of flying item blocks, some of which with 1-ups. The yellow pipe will return us to the main level in an rocky area. Go to the left when the water rises to get the 2nd Star Coin up in an alcove. Continuing to the right, you'll see the 3rd Star Coin under a log. Keep going right and you'll find an item block with a Starman. Get it and go under the log at the end of it and run into the Spinies to get the 3rd Star Coin. You may have to swim depending on the water level. Keep going right and take the yellow pipe to the flag.