Instructions
Get on the boat that is docked at the harbor on the main island. The boat takes you to the Amazon. When you arrive, you enter the Cortica River.
Swim through the river until you reach a group of piranha. Select the bag of food from your inventory by pressing the directional pad. Press "A" to use the food, distracting the piranha so you're able to swim by.
Use the Pulsar tool to soothe the caimans, or large crocodiles, if they become agitated by your presence. Swim past the electric eels carefully.
Swim a bit further until you reach Spirit Falls. Your diving partner recites a poem that gives you a clue to solving the puzzle ahead of you. To solve the puzzle, you need to activate the frog statues in a certain order.
Take out the Multisensor item and aim it at the frog statues. Look at the icon that appears on each statue. One icon is stone, or lapis, and the other is metal, or silver. Remember which frog is which.
Target the lapis frog and select it with "A" two times. Highlight and select the silver frog once, then select the lapis frog again. Select the silver frog one more time. This opens a path, allowing you to enter Spirit Falls.