Cape York Peninsula has a range of intact tropical rainforests , tropical and subtropical grasslands , savannahs , and shrublands , tropical savannahs , heath lands , wetlands , wild rivers and mangrove swamps . Cape York Peninsula supports a complex mosaic of intact tropical rainforests , tropical and subtropical grasslands , savannahs , and shrublands tropical savannahs , heath lands , wetlands , wild rivers and mangrove swamps .