The Wreck of the Mauna Loa Amusement Park Ride is a hidden replica of the real Mauna Loa. It only appears in the episode "The Wreck of the Mauna Loa."
It is built to act as an amusement park ride based on the real Mauna Loa ship. Later, the ride's existence becomes sealed and unknown to the rest of the world until SpongeBob and Patrick find it.
Once the duo finds it, they make it their secret hideout. Although Patrick spreads the Mauna Loa's evidence of existence, SpongeBob eventually draws Mr. Krabs' suspicion and makes him follow the two to their hideout. SpongeBob has no choice but to allow the treasure-hunting crustacean to enter the hideout. Mr. Krabs then finds out that the treasure is just tokens, the pirates are plastic, and the fact indicating the ship is actually a park ride. Suddenly, instead of finding treasure, he converts the ship back into an amusement park ride, but the ride is not safe, causing it to break. The police close it down, and everyone has to leave the "hideout."