Dear Penny:
If you are free on saturday,we would like to invite you to go camping. We make a decision to meet at the gate of the school on saturday.So if you want to come,ensure you ca arrive there on time.At the same time, I suggest you have MP3 and umbrella with you,Heavy clothes and sports shoes included.But don't take heavy skirt.I advise you to have sandwich and drink coffee.In addition to this, we plan to go hiking,please make preparations for it.
yours,
jimmy
文义有些不通,hope 要加 to do,不要总重复一种句式.
修改版在上面,请过目