The Scottish Outdoor Club will be jingling bells and roasting chestnuts on the island of Inchmurrin, on Loch Lomond.
The club were formed in 1938 and have been using the island to strip off in privacy since the 40s.
Secretary John Lindsay said: "We will have all the trimmings and the club house will be decked out with all the decorations. People will turn up wearing antlers and Santa hats and that sort of thing.
"We couldn't do it at Christmas because the club is closed over the winter."