there are several tourist spots for Great Wall...from the east of China to the west, for more than 6,000km...

the nearest spot is Badaling, 60km to the north of BeiJing...it's the nearest spot, therefore this place is crowd by tourists...IMO, better to experience the Simatai spot or Shanhaiguan spot...

if you like to sweat, try Simatai (wear T shirt, sport shoes and short pants recommended...)
if you like to see the beauty of the end of Great Wall in east area, try Shanhaiguan...

you won't regret...