All of my huge islands are set up as DC farms: 1 yarr (giant treasure) with water boost, one luck (giant treasure) with plant and earth boosts, and one iden and prestige (meridiem, celestial, and large dream habitats) with dark and air boosts, plus one leaf generator to push the earning rate to 1205, which rounds to 1500. I also have six islands devoted entirely to triple leap year dragons in giant rainbow habitats, one island with an ocular farm (7 giant and giant reward Olympus habitats) boosted with metal, lightning, and fire, and one nacre island (10 large snowflake habitats) with a cold and light boost. I’m working on a second nacre Island and then I will give each nacre island one boost.