What is the man going to do during the summer?

W: What are your plans for the summer?
M: I’m going to attend summer classes.
W: Summer classes? You’re kidding. Aren’t you burned out by the end of the term? Don’t you need a holiday?
M: Not really. I don’t carry a heavy class load during the year so I can hold down a part-time job. Then I take a summer class or two that I really enjoy.
W: That sounds like a good idea, but I don’t think I could stand taking classes year-round. So, what are you taking?
M: Geology. It’s a special course that’s offered only during the summer. I’m really looking forward to it. We’re taking a two-week field trip out to Copper Mountain where we’ll be collecting fossils and mapping the strata. Then we’ll return to campus to do lab work on our finds.
W: That sounds fascinating. Why don’t they offer it during the academic year?
M: Unfortunately, the department can’t hold classes like these during the year because students are taking so many classes at the same time, they can’t manage the field trips. Also the weather in the fall and spring can be unpredictable. It would be hard to do the fieldwork in a snowstorm.
W: Well, that’s true. What other classes have you taken during the summer sessions?
M: Well, I got university credit for digging on an archaeological site last year.
W: Oh? Where did you dig?
M: In Colorado. It was a buffalo-kill site. You know, one where the early Americans drove the animals off a cliff.
W: Did you find anything of interest?
M: Lots of broken stone tools used for butchering the buffalo.
W: You must have had a great time. I think I might consider taking some summer classes.