Where to go on your next trip? So many choices, no? Well, the Adventure Travel Trade Association is out with its newest survey of adventure travel destinations. Some of them, particularly in the developing world, may surprise you. The Adventure Travel Development Index (ATDI) defines adventure travel as interaction with nature, interaction with culture and a physical activity – at least two and preferably all three in the same trip. Researchers polled over 315 tour operators, travel writers, assorted tourism officials and hospitality industry experts and ranked countries on 10 factors including sustainable development, safety and security, health, natural resources, cultural resources and infrastructure. Here's the list they came up with of nations in the developing world. As a bonus, most are relatively reasonably priced for these tough economic times. You'll find the - less surprising but no less enticing - top 10 adventure travel destinations of the developed world at the end of the slide show.