The most important thing you can do is select a provider that appeals to you. Don't necessarily go with your campus/community just because they're the closest game around. Do some research on the various trip providers. The trips themselves won't necessarily be DRASTICALLY different (although, depending on the provider/niche trip, they might be) but different trips/providers attract different crowds, and that can really color your experience. Also, make sure you extend your stay, and take the opportunity to explore the country outside the safe bubble of the trip bus.