Always visit on a school day unless the school schedules a special weekend program for accepted students. Take a campus tour, even if you took one earlier. Read the posters, what are the activities/programs/speakers/concerts available for students? Read a school paper. Attend an intro lecture class: what is the interaction? Who is teaching? How engaged are the students? Visit the Career Center--do they have active career alumni networks helping students get jobs? Does the school help you get an internship? Ask lots of questions: academic requirements, core curriculum, retention numbers, social life, what would students you talk to change about the school?