Definitely look into Costa Rica then. They are one of the most biodiverse countries in the western hemisphere with a number of nature reserves. Great jungles, cloud forests, volcanoes, turtle preserves, birdlife, monkeys, etc. It is also a very friendly and lovely country to visit.
Costa Rica is a great suggestion. Also perhaps Belize, Galapagos, Puerto Rico, Hawaii, and really throughout the U.S. we have great nature preserves / national parks / wide ranging biodiversity.