According to Lonely Planet, the best places in Bangkok are free (or cheap!)
Lonely Planet has just put out a book that outlines the best — and cheapest — things to do in 60 cities. It includes 18 places in Bangkok to have a blast for little baht.
You can read full article here: http://bangkok.coconuts.co/2016/07/28/according-lonely-planet-best-places-bangkok-are-free-or-cheap