请英语高手帮忙看看我自己写的句子有无语病（急用,

题目

请英语高手帮忙看看我自己写的句子有无语病（急用,
I plan by plan(UA880）from PEK to LAX at Jul12 2009.then by Greyhound bus or warking to travel to famous Grand Canyou,Yellow Stone and Yosemite National Park and LA,LV,Sanfancisco,San Diego,Solvang,Hearst Castle,UnionCity,Monterey Bay,Seattle,New York,Houston and so on in my summer holiday of 2009.I want to spend 30-40 days in this.and stay in Hilton Hotel or Hostelworld and Buffet room.the last I plan going home at Aug 24 2009 by UA851.

答案

I shall fly by UA880 from PEK to LAX on July 12,2009.Once landed,I shall take greyhound bus (note:NO SUCH WORD "WARKING") to Grand Canyon,Yellow Stone and Yosemite National Park.For the rest of my 200...