One possible version
Dear Peter,
I'd like to tell you that our school has worked out a new program.
The purposes of the program are to make our school more beautiful,to make the air cleaner and fresher,
and to turn our school into a better place for us to study and live in.
According to the program,we will plant different kinds of trees,flowers and grass in and around our school.
A botanical garden will be built for us to visit and practice in.Besides,we are to build a small garden in which
we can do some reading and take a rest.What's more,some statues of famous people will be set up to encourage us to work harder.Don't you think it a wonderful program?
Welcome to our school if you have any chance.
Yours,
Wang xiaoming