Ofcourse shopping in Thailand is great, plenty of shops en nice low prices. Shopping in Bangkok is an experience most discerning of shoppers, whatever it is you're looking for, never forget. The mega-shopping malls like MBK, Siam Paragon and the night market in Patpong, Khao San Road, China Town and Chatuchak weekend market... its shop till you drop.
Also in Chiang Rai is a Night Market with lots of stands as is in almost any town in Thailand