There is an area of Bangkok called the "Green Lung" to which we like to escape periodically. It is an 8 k ride down a busy highway to the ferry boat crossing, which costs 7 baht (about a 25 cents). When you step off the ferry, you have left the concrete jungle behind and enter Bangkok of old, with traditional teak wood housing on stilts and green everywhere, both natural and some orchards.
There are raised cement paths everywhere (typical around much of Thailand due to rainy season) which are fun to ride on - you never know what you'll find. This day we went into the botanical gardens which has some paved trail and also some dirt, which was mud this rainy day when we went a couple weeks ago. The pic is taken from a bird watching tower.