Virgin drink recipes?!

Virgin drink recipes?

I'm having a beach party for my 13 year old and there are no alchoholic beverages allowed. Obviously I don't want to provide alchohol to kids, but us grown-ups would like to sneak a little into this public venue since it is a 5 hour long party from 4-9 pm on a Saturday.
I want to make tropical drinks for the kids since it is a beach, but be able to spike the grown-ups secretly. Recipes?

personally i like drinks with fruit and or juice in them.
http://www.floras-hideout.com/drrecipes/...
try that or this:
http://allrecipes.com/recipes/drinks/mai...