Take a taxi to Bangkok’s Southern Bus Terminal (it’s outside the city center), where you’ll catch bus #78. The bus starts running around 6 am and runs approximately every 30-40 minutes. The bus will drop you around 1km from the market in a non-descript area and you’ll need to catch a taxi or motorbike taxi who tried to charge me 100 baht, when it wasn’t far. When you get to the floating market, you’ll need to negotiate the cost of your boat ride.