A brief description of a few of them, based on my opinion:
Carleton: The students I’ve met have been impressive. Along with Mac, has the coldest winters.
Wesleyan: Progressive. Good vegan food. The recent publicity regarding drug usage is difficult to interpret evenly. Regardless, an excellent school academically.
Vassar: English major/artsy vibe, recently offset by their investment in an impressive new science building. Beautiful chapel and library. The gender imbalance, though real, does not differ significantly from the national average.
Hamilton: Benefits from the curricular, architectural, spatial, and, to some extent, cultural legacy of having been two colleges. A balanced curriculum, but also a writer’s college. Former fraternity houses are now beautiful residence halls.
Reed: The most committed to creating an intellectual environment, as manifested by their absence of intercollegiate varsity sports. Online posters who have self-identified as Reedies are either intelligent or humorless. Sometimes both.
Oberlin: Go for the vegan food, stay for the academics.
Colgate: One of the most beautiful campuses in the nation. Authentic countryside location and village. Comes closest, with Bucknell, to a state flagship environment due to athletics and fraternities. Nonetheless, is still much closer to the others in this group.
Macalaster: In contrast to the other schools, provides an urban experience. Presence of international students adds diversity.
Colby: Classic LAC size. If you go smaller than this (consortia excepted), you will sacrifice either athletics or curricular breadth. Of the Northeastern colleges, has the coldest winters.
Kenyon: To select Kenyon is partially to select Middle Path and Gothic architecture. I’ve heard of worse reasons to choose a college.
Pitzer: Consortium. Lower SAT scores than all but one of the others in your group should not be overlooked entirely.