This coaster has 6 sections separated out by fountains. In the first four sections, a single letter is encoded using a common puzzlehunt encoding scheme. In the last two, you can find a letter shape.
At the time of writing, I was enjoying playing through RCT2 again for nostalgia, as well as watching Marcel Vos' excellent videos about the game. I was also inspired by this intro round DP puzzle to help newer solvers practice recognizing common codes.