I took our family to Lake Placid for a couple nights before dropping off one of our girls for her first year of college in VT. What a cool, laid-back town. The quaint Olympic village feel is still there. We did canoe-ing on the lake, did the chairlift and the elevator to the top of the ski jump facility, saw the museum (acquainted the girls with the Miracle on Ice and the days of US-USSR, which they are vaguely aware of), saw Whiteface Mountain (some pretty cool hiking at the top with a castle maintained my the National Park Service). It's just a nice town with some interesting shops. Plus Lake Champlain is not too far, and you can take a ferry to Burlinton, VT, which has a nice boardwalk shopping venue.
I'm not sure how far that is from Erie, however. But Lake Placid is a nice relaxing few days and decent for family.