Dear Mr. Smith,
How is everything going on? I want to join a summer camp, I plan to take part in a summer camp in the USA after the college entrance examination in june.your University happens to offer such a good chance.
I'm writing to know about the details about the arrangements.lf you could arrange some visits to some famous universities during the summer camp.
In the end, last but not least, I hope you could have some activities in advance.
I'm looking forward to your reply.