CheapFlights.com has put up a surprisingly in-depth guide to travel in Nicaragua:
This beautiful Central American country has regained its footing and is now happily open for tourism. The infrastructure is developing and one UN report called it the safest country in the region and one of the safest in the Americas. It also may be one of the most authentic and least spoiled.
Its elegant, beautifully understated neo-colonial hotels, historic cities and dense, unspoiled rain forests, an ecologist's delight, will attract the genuine traveler and not, perhaps, the indifferent tourist.
Nicaragua's east or Atlantic-Caribbean coast is virtually uninhabited, the emphasis here more British than Spanish. Scattered outposts like Bluefields and Monkey Point across the vast untouched interior lead to the outer Little Corn and Big Corn Islands, paradises for naturalists, especially divers and snorkelers.
There's also some great eco-tourism stuff here.