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My wife and I have been trekking with Willie in september 2004 for 4 days in Mulu national park: Caves, Pinnacles (somewhat challenging ascent : see photo), headhunter's trail, night in a longhouse, boat.
Willie is a good man and very interesting person with extensive knowledge of his land : traditions, rainforest, animals... He knows a lot of different locations in Sarawak and Sabah. I look forward to see him again.