Has anyone travelled to South America? 10 Points for some help!?

My friends and I (four of us in total) are considering to go to South America at the end of the year. Where are the best and safest places to go? We know we want to begin the trip in Peru (we'll spend 1 week there) but we don't know what to do after that...The Peru part will be mostly trekking, so we'd prefer to go somewhere really fun for the next three weeks. (Somewhere where we can learn to tango and get drunk and meet hot men). Also, where are the safest places? We are all 19/20 year old females so I guess you could say we're 'easy prey' for predators. Also, where should we go with guided tours and where should we just do things by ourselves? Thankyou!!

Tango: Buenos Aires, Argentina.

I recommend you stay away from south america unless it's a large group with tour guides. If you want the flavor of the culture go to someplece like beleize or costa rica. Both places are safe.