Trever Hall is sometimes referred to as "off campus" housing. That's a joke, as the campus is rather compact, and nothing is very far away from, say, Main Hall. It's just the most "remote" of the dorms--about three minutes walk from Main Hall.
I am not sure about Hiett Hall, but I believe the rooms in the other dorms are not air conditioned. (I think this is the case with all but the newest dorms on most campuses in the north. It's true, for example, of many/most Ivies.)
Yes, College Ave would run along the bottom of the picture. This map might help
http://www.lawrence.edu/about/lumap.pdf
The College Ave Bridge (east of campus and over the Fox River) is being replaced. The project is to take 17 months and should result in a reduction of traffic. (It's out of sight and rather far away--further than suggested by the map, so construction sounds shouldn't be a problem.)