Does anyone know a good good goodbye song for a crying-filled situation?

Okay well I am going to an international summer camp in a few days,
and the end of these sumemr camps are always very emotional, so I
would like to sing a good goodbye song to bring it all to an end.
Problem is I cant find a good song to fit this situation.
Not looking for a f-off goodbye song, but Im looking for a song that
would fit with the fact that you are saying goodbye to an experience
and friends that you probably will never see again. Thanks!