Read about your host country before going.
Be aware that you will experience accentuated highs and lows on a relatively short (semester or summer) program. Over an extended period, you should adjust to the culture, as it becomes more familiar. Be sensitive to these adjustments and realize that you are growing and changing during the experience.
Upon return, try to understand some of those changes. There is so much to share with your friends and family. Do so! You can help others learn about another culture through your experience.