I have had my daughter (9yr) write reports on the transportation systems we used to get or while at disney. ie., airplane, rental car, disney bus, monorail, etc. She also picks a country in Epcot, investigates it before we leave, visits the country and talks to a CM, then returns a report to school. You could have the girls write an essay for English.
French - visit France and have a conversation with one of the CM's, then do a written or oral report on how easy or difficult it was, etc.
Good Luck. I find we incorporate education with all our vacations.
PS. One year had my son , then 4 yrs) draw pictures about the things we saw and he took them to his preschool teacher as his "homework"
Enjoy your trip.
Julie