This is possibly the single most publicized thing to do in Lake George, but don't be fooled! This place is ridiculous. More than half of the information is wrong, the displays are out of date, and the tour is a rip off.
Unique Suggestions: Play some miniature golf. There are two courses on the fort grounds, and it's the only thing really worth doing there.
Fun Alternatives: If you want to experience some actual history at another forst from the Seven Years War and the American Revolution, drive about 45 minutes north to Fort Ticonderoga on Lake Champlain. It's worth it.
For New Yorkers: the food service is really slow, we spent an hour every day to have breakfast and found out that best time to have it is between 9 and 10 AM. Also in some places you cannot eat breakfast after 11 AM. Whatever you say they won't do waffles for you after 11 AM! In general food doesn't taste special. All you can cook by yourself in 30 min.