You can go from Phaya Thai Station (N2) by MRT to the end station named Mo Chit (N8)
Chatuchak Weekend Market is the largest market in Thailand and it’s perfect to shop clothes, souvenirs etc. http://en.wikipedia.org/wiki/Phaya_Thai_Station http://www.bts.co.th/customer/en/02-route-area.aspx http://www.bangkokmetro.co.th/?Lang=En http://www.bangkokmetro.co.th/map.aspx?Menu=8&Lang=En
http://en.wikipedia.org/wiki/Chatuchak_Weekend_Market