A Ninja training ground located in the deepest darkest heart of the Amazon rainforest, of all places. The training ground is further disgused as a ninja-themed amusement park.
You get to meet Frank's master who tells him to complete a series of trials to become a "master" (to get the best rank). His sidequest includes doing a flying squirrel jump (momonga arts) which, depends on you, can fly farther or shorter.
Before heading to the end you need to obtain the secret ninja writings which is secretly hidden on one of the many islands.
By reaching the northern and last island, Frank faces his master, which turns on him. His master uses a giant Kebab as a weapon. If you are victorious, you obtain the weapon which The Jonin uses: the Spicy Skewer.