You are correct that the youth activities crew members aren't allowed to accept cash tips, but you can provide them a small gift. I'm not sure how many there are. Quite a few. I wouldn't worry about getting something for each CM. On our second to last night, I brought down a small gift bag filled with candy (miniature Snickers, Reese's, etc) and packs of gum with a note that the gift was to show appreciation for all the Kids Clubs crew members. The CM I gave it to seemed really excited to receive it and promised it would be shared by all.