by Sheri de Borchgrave  I've faced down grumpy hippos on safari in Botswana's Okavango, dodged camel spit on a trek in Mongolia, and kept my lunch down on a hurtling dogsled driven by ebullient Lapps. But hanging out with headhunters? Less adrenaline rush, maybe. But creep-out factor? Erk... I was on the world's third-largest island (a bit over the size of Texas) as part of my visit to Malaysia, which shares Borneo with Indonesia and the entire sultanate of Brunei. And it was a far cry from the urbanity of Kuala Lumpur - jungle-covered, mountainous, and usually quite remote..