During the lobster suit part, when you come out of the water, there will be a portal in front of you. Go through it and kill the three worm-like creatures that come out of the ground, then collect the Rokker gems (the small gems that appear from the monsters) and health if need (feathers refill health). Then, turn around and return through the portal previously exited. When you go back again, the monsters will appear again. Repeat this for tons of experience. Each time you kill the monsters you will get 33 experience points.
After the chicken suit part, you will see two enemies. There is a red one with a shield and a bluish-gray one without a shield. After killing them, you will see a pole with three prongs. Go to it and jump up. You will see a rock wall crumble, opening a path. After you go through the path there is a cave to your left. Swim through the water. You will find a small opening to your right with three bolder-like objects. If you break them open you will receive some money to buy shaman jewelry.