Vietnam offers a wide selection of outdoor activities for those who look for active adventure holidays in Vietnam. The most popular outdoor activity is trekking, hiking through hill tribe villages, meeting up with local friendly people. -Vietnam trekking tours should be booked in advance since there are lots of things to be prepared before your departure. Most of the treks are required permits since the hiking trails will take you through to remote and isolated hill tribe villages, the frontier border. The authorization paper can be arranged through a local tour operator. - Trek Ngoc Son Ngo Luong, Hoa Binh province, North Vietnam. The two-day trek offers opportunity to hike through Muong villages, to taste local food and to spend a night at a local stilt house.