If you have some extra time, we highly recommend taking a few weeks to explore the best of Central and South America. There are such varying cultures and terrains, you simply can’t do it justice in one week. Guided tours are usually the best way to do this unless you have a knack for planning itineraries. Machu Picchu, Argentine Patagonia, and Rio de Janiero are the most popular destinations.
If you are short on time, Costa Rica is a great all-in-one stop as you can visit the city, beach, and rainforest (complete with volcano) all within the same country and in a few days.