Forgotten Isle

Walkthrough: After coming-to, Mario will find himself in Forgotten Isle of Lost Kingdom. The Odyssey has taken fierce damage from Bowser's assault, forcing Mario and Cappy to find at least ten Power Moons to restore it once again. Begin by heading south of the Odyssey Airship, finding a lower ledge by the shore that holds Purple Coins. There will be a keyhole in the ground, but the key will be out of reach in the poisonous waters.

Since you can't do anything with that keyhole, head back up top and north of your ship to find even more Purple Coins in the treetops. Before you know it, you should come to a clearing that will allow you to cross another river of poison. But right as you reach said area, a giant bird with the name of Klepto will swoop down and steal Cappy away from Mario.