Costa Rica is a very popular spot for eco-tourism.  It combines low cost and easy accessibility with a stable government and a friendly exchange rate.  The Capital, San Jose, is in a valley with dormant volcanoes on either side.  If you have the time, they are definitely worth seeing.  From San Jose, the costal regions of Guanacaste and Puntarenas are less than a day's drive away.  These areas provide a variety of attractions for tourists of all types.  This area on the Pacific Ocean is known for its surfing as well as its wild life.  Getting there can be part of the fun.  It is not uncommon to see brightly colored tropical birds flying around your car.  A stop at most any eating establishment along the way will provide a glimpse of unusual animals.  It is not uncommon for the restaurants to have small, tame animals around for you to watch or hold - one restaurant even has a tame toucan that you can hold.  There is a volcano called 'Arenal' on the way to the coast that is active.  It has not erupted since 1968 but it still produces puffs of smoke and at night glowing hot rocks can be seen spewing out of the top. http://www.arenal.net/

The Arenal volcano area is one of the rishest areas of Costa Rica for ecotourism. You could spend many days simply discovering different natural atractions in the area. For more info http://www.arenalvolcano.com

There are many small “resorts,” nature retreats, and eco-lodges popping up all over Costa Rica.  They provide a variety of choices in a variety of price ranges.  Places such as Tapyeba can provide great alternatives for the budget minded traveler.  This camp is near hiking, biking, and horse back riding trails. Other elegant eco lodges include the Inn at Coyote Mountain, located in the mountains near the Central Valley overlooking the Pacific, and Finca Rosa Blanca Country Inn in Santa Barbara, Heredia, which combines unique architectural style with comittment to environmental consciousness. Both of these inns have received worldwide acclaim for their sustainable tourism practices combined with their locations in beautiful natural settings. It is important to distinguish between inns and hotels that simply have a location in nature, and those that actually specifiy exactly what practices and monitoring they do in order to minimize environmental impacts and help the local economy and society. Costa Rica is one of the few countries in the wold that has a certification program for sustainable tourism.  Other organizations, such as Sustainable Tourism International and the International Eco-tourism Society also provide certification, accommodation listings, and information.