I looked into this last year although our group did not materialize. I know your group has to have at least 10 children and there are various options you can choose. Chaperone's pay the same rate for the tickets as the kids. The # for the education department or whatever they call it is 800-833-9806 and they were very helpful when I called. Last year they were running two different things. One was a specified day where you went to Epcot and met with CMs who talked about different things generally regardign the country they were from. The other is that you get a guide book but are free to explore the park on your own. There were several day ticket options available. YOu could add both park hopping and water parks priveledges to the tickets as well but I do not know if you can add nonexpirey or if the tickets are activated the day you pick them up or if not until their first use.