Dear All,..

I will in hongkong next month,... and i want to visit the great wall of china,.. Can you please tell me which the best way for me?( train or bus?) if fly i really don't want because it cost us too much,...and where should i take it? what schedule time?,.. how much it cost?,...and if i spend two days just come and go from hongkong to great wall is it enough? thanks so much,..