Here are the pros: Whitman had a great basketball season this year; they offer an Intro to Sports Medicine Class; you can get a work/study job as an athletic trainer; many students go into health/medical related grad programs; the campus is great; the students love their school; the academics are excellent; biology is one of the most popular majors; classes are small and the faculty is very dedicated; Walla Walla is small but has many excellent qualities.
On the other hand, true to it's liberal arts mission, all freshman are required to take Encounters, a year long exploration into world philosophies, religions and literature. There are also distribution requirements that cover a broad range of disciplines, the aim being to expand all students horizons while teaching them to think critically and communicate effectively, orally and in writing. Most people choose Whitman because they value a close-knit community, a liberal arts education, 3-D sports, a collaborative academic atmosphere, and an accepting fun-loving culture.
You're looking at a ton of schools and you have stated a very specific goal, so ask yourself if there is any chance you might change your mind as you are exposed to new things and ideas. Does a broad undergraduate experience with room to explore appeal to you? Or, do you prefer to go directly into your chosen field with laser-like focus? Would the requirements outside your area of stated interest be welcome or resented? These are probably the most important questions to ask yourself as you try to shorten your list. It's an exciting time, good luck!