Before this program, I had only left the country once before, and that was to go to Montreal in Canada. I was a little nervous joining the program the to that, but my fears were groundless. This program was stunning in scenery, meticulous in safety preparations, and fascinating in class information.
The field trips were all worthwhile, and allow you to learn more about the culture and ecology of Peru (Andes, Amazon, and highlands) than most tourists could ever dream of. Additionally, it allows you to avoid the more touristy locations and find peace in some harder to reach locales. The program's itinerary is changeable though, as we found when half the program fell sick and could not make it to Manu Wildlife Center (arguably the highlight of the program). Even with this, though, the amount of information we learned and the amount that we traveled seemed unparalleled by any other programs I had researched.
I would hands down recommend SFS Peru for a study abroad program. I would recommend staying after to sightsee and let your hair down a bit, for rules are strictly enforced during the semester and spring break for safety purposes. And if possible, I would also come down early to get a deeper understanding of the language and the present culture too (for SFS lodging is in what may appear normal in the States but are palaces in terms of Peruvian standards of living).
I learned more during my semester with SFS than I had learned in the previous year in University, in addition to meeting and befriending many like-minded nature nuts and hiking pals. I hope that you have the same or better experiences!