I agree with honesty. Now granted, I am an adult student, so my teachers might have been easier on me (since we're the same age

), but I was honest about our trip to WDW in 2004. They didn't do anything extra to help me, as a college student it was my responsibility to get notes, turn things in early, etc. But they didn't give me a hard time. However, just FYI...when you get your syllabus, check to see if you have any tests those days. A handful of teachers might work with you to take it early, but most, in my experience, will NOT let you take tests early or late. For instance: one time a 14 year old girl was in our class taking early college classes. The night before the final, her father died. We knew he was sick and in the hospital, but it wasn't exactly expected. Her mother called one of my study group (we'd kind of taken her under our wing), and that person went to inform the teacher. The teacher's response: "well, she has a 'B' in the class, but I'm not allowed to let her take the final any later then a day from now. If she misses it, all I can do is give her in incomplete for the class so she doesn't have a failing grade."
It sounded so harsh to me, but that was just school policy. So just be aware...some schools, and many teachers take tests VERY seriously. If the trip is important to you, you might be better off dropping the class during drop period if you find out a test is on one of those days.