Here is a really funny glitch. You know that the Fierce Diety mask turns you into an adult? Well, here it is. Do the glitch "wear fierce diety mask outside of boss battles" and then when Kafei runs away, jump in the water and you'll fall to southern swamp. Run through the water until you get to the tourist information booth. Go in, and talk to Koume. She will say, "sorry, the boat cruise is for humans only."