What countries can be called unusual for travel? I'm tired of big cities, I need something more natural like wild nature.

Wildlife is very cool. Especially if you choose an interesting and well-organized tourist tour so that you don't have problems with moving around the country, places to stay and so on. If you are looking for river cruises in the Peruvian Amazon check this website. It seems to me that you will like Peru, the Galapagos and South America in general.