According to the International Ecotourism Society, tourism is the second most important source of foreign exchange for over 40 of the poorest countries. To ensure that those dollars are spent in ways that promote both conservation and social development, check out the Ethical Traveler's List of Best Destinations (www.ethicaltraveler.com).
The site strives to include only those countries that meet both criteria. Bhutan, for example, has a good environmental policy but a questionable human rights record. Barbados, Belize, Costa Rica and Slovenia are among those that earned high marks.