In the central south of the map, there is an island chain. Towards the center of the island chain, there is an island where the only monster that spawns is a golden poo. The island has a slight raised center, and only has 1 chest on it. Battle these golden poo's repeatedly, using the poo bracelet and shoes of hermes to strike first. Each battle gives you varying amounts of gold, but they can go up to 10,000 or more for just killing one monster, along with 1000 xp and 10 SP.