You should try going to Peru, Brazil, Chile and Argentina. These are the places i would suggest.
Peru: Inca Trail, Cuzco, Puno (Lake Titicaca), and Lima.
Brazil: Iguassu Falls, Rio, Amazon, Pantanal and Bahia (There is a lot to do in Bahia, you should check out Salvador, Sauipe, Praia do Forte and Chapada Diamantina).
Chile: Patagonia, Easter Island, and the Lakes region
Argentina: Buenos Aires
have a look at the website below, you will find more information on these locations and then decide where you want to go.
Have a great trip!