What could I buy my parents for their 35th wedding anniversary?

There are five kids in my family, so we could probably go together and get them something nice. Their anniversary isn’t until May, but I would like to plan in advance. They are already planning an anniversary trip, so we can’t do that. I don’t really want to get them anything coral-related (that’s the gift for the 35th), but I would like something nice/unique. Does anyone have any good ideas?

Why not have everyone chip in and give them an anniversary party at some nice restaurant before they go on their trip? Take lots of pictures and put them in a special photo album for them. This seems much better than buying them something.