Dora and Boots follow the directions of Map to investigate the source of a mysterious sound ("Hic, Boom, Ohhh!") coming from Yellow Valley, that they heard whilst playing a game of "Loud and Quiet". They traverse a "noisy" river (with the assistance of Tico who rows over a blue rowboat, the only rowboat available with any life jackets and without any holes) and a "quiet" forest (using an acoustic horn from Backpack to awaken the sleeping Big Red Chicken who is blocking the only path, then also u