Fred,
This is a big day in his life as you well know. He will feel for the first time that he is actually free and on his own and it will be a little frightening at first. But once he starts to get to know the other students and gets involved in things, he will have some of the best times of his life. And it isn't like he is so far away that you can't go see him from time to time. Have a great time on the trip and you should be proud.
There will be the monthly checks to deliver.
Ron