1. When you're visiting several colleges during the same trip, and you're getting toward the end and they all seem to say the same things, and yo're getting a little tired of it all - hang in there. One of my students who visited 19 campuses during a ten-day trip from overseas told me that she stayed focused all the way through because, as she said, "I figured that the next one might be THE one for me, and I didn't want to miss it."
2. Take photos and take notes during the visits; then each night, write your reactions to the school in a journal. This will come in very, very handy two months later.
3. Parents and students might think about taking different tours, and comparing notes later. If you do take the same tours, try to keep your reactions to yourselves until afterwards - then compare notes.
4. Before or after the tour, eat breakfast or lunch somewhere on campus. Ask current students what they like and don't like about the school. Don't ask IF they like it, but WHY they like it. Come up with two or three questions to ask at every college and ask them of the tour guide and random students you meet.
5. Have fun!