Are you into hockey? You can go and see the Olympic Stadium where the Miracle on Ice happened during the 1980 Olympics: USA Mens Hockey team beat the heavily favored Soviet Union team. USA scored in the last 5 seconds of the game...touted as the greatest sports moment of the 20th century!
Oh, and there's a pizza place across the street that makes good NYC style (t-h-i-n crust) pizza. Try to get out on Lake Placid if you can -- there's a tour boat ride on the lake that's fun. Renting a kayak is another option. If you're a hiker, you'll be in heaven! The Adirondack Mountain Club has a good selection of up-to-date trail books for sale:
www.adk.org. It's a beautiful area, you've chosen well!