With a population of just 818,000 (and just over the size of Kansas, or England and Scotland comined), this is a country relatively few people have heard of, but will soon be be much better known - in part because huge recent oil-field finds are poised to make it a "petro power" and because more and more travelers are coming to appreciate its ecotourism riches. Bordering Brazil, Suriname, and Venezuela on the north coast of South America and with a coastline of 285 miles, Guyana is con