Well, only you can decide if it's worth the cost to you. I spent a month in Cambodia after first year volunteering at a pediatric hospital and had a great time. It wasn't cheap (airfare alone was ~$1300, although of course once in the country costs are low) but I felt like it was worth it. I got to do/see many interesting things at the hospital, and also had some free time to travel around a bit. If you could extend your trip by another week or so to just have fun and see the country, this might improve the value of the plane ticket. I can't think of anything I would have rather done with my summer, and all of my classmates that traveled abroad last summer (probably at least 1/4 of the class) seem to have had great experiences as well. I'm hoping to travel in third year during our elective period and possibly again during fourth year. International travel is usually expensive, but if it is important to you to see the world than it is money well spent (or loan money well borrowed, as the case may be).