You should visit the Carleton website; they have pictures of the campus and answers to a lot of your questions. The average class size is 18 and 67% of students study abroad. Upper-level classes have fewer students, but are still not difficult to get into, even as an underclassman. One advantage of the trimester system is that if you spend fall semester at another school, you'll only miss Carleton's fall trimester. This can mean getting half a year's worth of credits while only missing a third of the year. And while Carleton has a number of its own programs, it's also fairly easy to get credit for a program you find on your own.