Bridget, you're asking about the right things, but with due respect, I'm not sure in the right way. As others have alluded to, all of the Ivies have the resources to provide a very dynamic experience among and between students, faculty, and alumni.
You touch on two things that are very important in looking at college: teacher-student interactions, and what the industry increasingly calls "experiential education." As to the former, while scanning websites or taking tours, see how often and how substantively faculty include students in their research. In addition to Ivies, most liberal arts colleges emphasize experiences like these. On the latter point, see how integral field work is to an institution's curriculum. For instance, Drexel's program includes either one or three co-ops during your time on campus, and Connecticut and Earlham Colleges provide funding for internships and off-campus experiences.
You're right to be thoughtful and a little "picky" about where you go to college, but in the end, quality institutions provide quality educations, and it's on you to take full advantage of them!