Suan Rot Fai is located slightly northeast of Chatuchak Park The park sprawls over 150 acres in a space that was once a golf course for the State Railway Association which was subsequently turned into a park. Bicycling is the top activity in the park, and there are loop paths around the park of about three kilometers which are completely car free. Picnicking is also a top draw, and you can rent bamboo mats, bicycles, and buy food at the park's northern end. Best of all might be the completely free Butterfly Garden, a living museum where a lush garden has been sealed off from the sky by mesh covering, and is home to dozens of species of exotic tropical butterflies, some of them quite large like the giant Golden Birdwing. There are plenty of avid micro photographers spending hours in this living greenhouse, and the beautiful collection of butterfly species (which are also fairly well described on signboards in English and Thai) makes a stopover here a must on any park visit.