Lake George is nice, but it is really touristy. Not the "real" Adirondacks.
That said, expect to play premium $$ for everything. Hotels may require a 2 night minimum stay, restaurants are only open seasonly, so they need to maximize their profits during the summer. Traffic and parking can be a nightmare.
There is a theme park between Lake George and Glens Falls.
Gore Mountain, one of the large ski resorts, does gondola sight seeing rides to the top of the mountain in the summer isn't too far away.
If you venture up into the high peeks area, Lake Placid has some interesting things to do. Don't forget, the Adirondack Museum in Blue Mountain. There is also a new museum in Tupper Lake.
There is a big water park in Old Forge. Near Old Forge there is also a nice, relatively easy, mountain to climb, Bald Mountain. It is fun but not too hard.
Just 30-45 minutes drive south of Old Forge is a small community called Forestport. There is a restaurant at Forestport Station call the "Buffalo Head". It is not much to look at, but the food is fantastic (steaks, prime rib, seafood, and the coconut creme pie is to die for).