Cocopah Lands Act - Provides that if the Cocopah Indian Tribe of Arizona transfers title to certain described land to the Secretary of the Interior, the Secretary shall take it into trust for the benefit of the Tribe, if there are no adverse legal claims to it, including outstanding liens, mortgages, or taxes owed. Considers such land to be part of the Tribe's initial reservation. Prohibits its use for gaming under the Indian Gaming Regulatory Act.