I just registered at these forums....
We have been to Lake George Evergreen Escape Campground multiple times, and it has been great everytime. It is a large, well run campground, and many of the "employees" are workcampers so they are very good. The "camp store" is HUGE, it is a full size store, not just a convenience store. There is a lot to do at the campground, with many things costing extra, but also alot of free stuff, you just have to ask.
Try not to go too early in the year, as sometimes the river can flood the riverside campsites.
When we went last year (family of four), my son and I drove up to Fort Ticonderoga. It is very much worth it, a really great place to learn about the revolution. And it is the legitimate fort, not a replica. Make sure you drive on 9A North, which goes along the lake. It is a very scenic (and hilly!) drive. Rte 9 north parallels it, but it is just your normal boring highway.