请英语高手帮忙看看我自己写的句子有无语病（急用,

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 2009 summer holiday,I shall travel to the cities of LA,LV,San Francisco,San Diego,Solvang,Hearst Castle,Union city,Monterey Bay,Seattle,New York and Houston.This may need 30-40 days in this summer.For accommodation,I shall stay in Hilton Hotel,Hostel World and Buffet room.By August 24,2009,I shall return home by flight number UA851.