What are good treasure hunt clues for boats on the water?

Good treasure hunt clues for boats on the water should involve navigation and observation. For example, you could use a riddle that references a specific landmark, such as "Where the lighthouse stands tall, your next clue hides near the rocks by the waterfall." Alternatively, you can incorporate coordinates or compass directions, like "Sail 30 degrees east for 100 yards, where the seagulls gather, your treasure will be not far." These clues encourage participants to engage with their surroundings while making the hunt exciting and challenging.