By now, your student should have brought home a handout delineating trip costs. Students will need additional money beyond the actual trip fee. They can be used anywhere, anytime of the day or night and if this is the first big trip away from home, on their own, it buys peace of mind for anxious parents. Entertainment on the bus trip always helps. There will be VCRs on the bus.
Movies are great, but no R-ratings please.
A camera and film are big hits as students like to share their memories later with family and friends. Traveler's cheques are always hot items. Be aware, they will need spending money for lunches, dinners, snacks and souvenirs. A little advance preparation will help insure your students' experience will be enjoyable.