Grass is a pretty good size lake but shallow around Blarney's. there are alot of big boats out there and you should have no problems. Grass lake is connected to 7-10 different lakes that go all the way to the WI boarder, so it depends where you are coming from as to where you should launch. There is a free ramp right by Blarney's at the IL State park. As far as bringing the kids,
as long as they are going to stay on the boat their ok, but they don't allow anyone under 21 after a certain time on Thursday.