Also, you can throw a bomb into the water, then run on top of the seesaw and wait for the bomb to go off. Do not move. Then, once it goes off, you will get flung up and will float for a second or two before falling back down.
Fun Fact: If you hold a person below you, jump, flick and hold the person again still facing down, then jump again, it is possible to jump higher than normally, and possibly infinite jump.
