Read this site, Wash U website, my own AMCAS application
What impressed you positively?
The students are SO friendly; they are obviously all smart and motivated, but seem to use competition positively. They love the school and love to talk to you about it.
What impressed you negatively?
My tour guide was the only student I found who was kind of snooty and not too receptive, but even he wasn't so bad.
What did you wish you had known ahead of time?
that it would be so hot in St. Louis in October! Check the weather before you go--I've been to St. Louis in winter and assumed it would be cold now, but I walked of the plane into 80 degree weather
What are your general comments?
It was great. Wash U is a wonderful place. My interviewer was very relaxed, very friendly, and made this a great conversation which ranged from movies to climbing Everest and back to my application.