On the island of Borneo , the great natural attractions are Sarawak 's caves at Niah and Mulu , river cruises with a visit to tribal longhouses , Sabah 's national parks of Mount Kinabalu and the offshore islands , and the Sepilok wildlife sanctuary .
Sarawak 's caves at Niah and Mulu , Sabah 's national parks of Mount Kinabulu and other attractions can be experienced on the island of Borneo .