Montezuma's Return!

Max Montezuma is a soldier descended from the ancient Aztec emperor. His plane crashes on an uncharted island no map has ever recorded — and the island turns out to contain an intact Aztec civilization. All Max has is a flashlight and a canteen. What awaits him is a desecrated tomb that needs to be restored, a mystery connecting his ancestors to a race of saucer-flying aliens, and the full weight of being the first outsider to walk into a lost civilization's world.