This is how to decorate your trap from Tricky Traps, Shallow Pool, Deep Pit





Line the pool with glowstone to make it easy to see from above. Then, make a diving board about 20-30 blocks high. Lastly, put a sign next to the diving board on the ground saying "Diving Board". This should make it more legit, and attract some attention. I hope you get enough loot, as I did.