Start the course, then head past the first Bowser-branded icemaker to find a wooden tower with a pull string inside it. Jump to grab onto the pull string and pull it as far as possible to reveal this ...

To find the first Flower Coin, enter the Warp Pipe in the opening area, then quickly swim past the Smackerel lurking in the water. Just past the Warp Pipes ahead, you'll spot the Flower Coin beneath ...