I am an Ontario Teacher working for a public school board. I am also a full day kindergarten teacher and IMHO I fully support parents who take their children out of school to go on vacation. Currently I have 2 students on vacation from my class 1 is in India for a month and the other is in SriLanka for 3 weeks. When they return they will be better for their trips away, they will have memories to last a life time and extra time spent with their families. This is just as important as formal schooling. I have taken my own children out of school twice during my maternity leaves for vacations. Travelling in the off season is cheaper and the parks are less crowded. I would highly reccomend taking your grade K-8 children out of school, they will catch up on anything they miss. I don't know of any child who failed a grade because they went on vacation. Have fun, life is short.
P.S. I would highly recommend Disney during the first or second week of school in September. The parks are EMPTY!!! We did every park in 1/2 a day and spent the afternoon at a waterpark. The lifeguards at the water park said we were the only people in the lazy river! It was sweet!!