Thanks to Nancy and others for pointing out my error with respect to The Catskills and Lake Place - specifically the fact the the latter is not a part of the former. This was my mistake. There are definitely family photos labeled "In the Catskills, 1966", etc. so I know they did summer there. It was another family member (who would have been quite young at the time and not 100% reliable) who recalled being in Lake Placid. Thanks, Graeme.