One way of seeing Bangkok is by bicycle, you will be much closer to the people and see a lot more than you would from the inside of a mini van.
One such tour group that offers bicycle tours of Bangkok and nearby is the ABC Amazing Bangkok Cyclist (website or Phone: 66(0) 2665 6364 Mobile: 66(0) 8181 29641) and they come as highly recommended.
The rides will take you through the slums of klong toey, then over the Chao Praya
River on a small boat and then into the lush plantations of an area that feels completely remote from a teeming metropolis which in reality is but a few kms away. Stop at a weekend floating market and take in the sights while enjoying a sweet traditional thai tea or coffee.
Of course, once you are familiar with the area you can just do it yourself, but for the first time a tour guide is a good idea.
There are many concrete paths scattered through out this area. Sometimes the paths are elevated up to 1.5 metres above the mangroves and water, at other times they are level with the ground. Some care is advised when riding.
In the days before google maps we had to draw out our own maps. *Note, I will upload a larger resolution file of this map later.
The weekend floating market is great for purchasing snacks and drinks, though there is also plenty of small Mom and Pop coffee shops and cafes scattered around for a break from your riding.