I really used to like it when we put the kids kind of valentines in envelopes that we had taped up in our school room. First the girls put theirs in while the boys 'hid'. Then the boys put theirs in while we hid. We always peeked because some of the boys (and girls) put more than one Valentine in a special one's envelope. The boys peeked as well as we girls did the same thing. It was all pretty embarrasingly innocent.