An all day pass allows pass holders to get on and off the river boats as many times as they want. The boats take people to and from the many piers along the river kind of like buses on the water. When they pull up to a pier to let people on and off, the boats bump up against the floating docks with a solid impact. It's best to hold on to something until the boats come to a full stop. We saw one man fall down hard when one of the boats bumped up against a pier knocking him off of his feet.
Be prepared to board or disembark when the boat arrives at the pier. If one is dithering about gathering their belongings as we were the boat doesn't wait. It only took once for that to happen in order for us to learn our lesson! No need to panic though; it's easy to get off at the next pier and catch a boat going in the other direction.
Fun to ride, but they get scary crowded during rush hour as many locals use them for their work commutes. There were way more people on board then there were life jackets during rush hour.
There were boats on the water unlike anything we have at home.
Along the river banks there are many interesting things to see from opulent high rise hotels to traditional Thai style buildings.
It was a fun day and something I'd like to do again - maybe next year!