You know, I've tried to figure this one out for a few years. I Googled the term Leisure Links Guest, and while I admittedly did not have time to peruse all of the 1,440,000 items found in 0.11 seconds, none of the ones I read had anything to do with Marriott. I know in the past (as opposed to now) when I used this code, it did not require ID. I also looked through the Marriott Website, and could not find any mention of this rate code. Some secret society maybe, just kidding. Sorry but I can't find anything. Maybe somebody else can find something. I can hear Marriott's answer now, "If you were entitled to it, you would be a part of it and know."