One excellent Woodstock recommendation with your group is Family Tradition: http://www.familytradition.net/
This is a typical southern restaurant serving a variety of meals with meat and vegetable choices. There should prove to be something appropriate to everyone's tastes.
Dave & Buster's is a fun place for young people with dollars to spend. The food is decent. Pappasito's is very near Dave & Buster's, can accommodate a large crowd, and serves (according to reports) very good Tex-Mex. I prefer Cazadore's on Sandy Plains Road, Marietta for Mexican. It is cheap, fast, and good.