You can get to the Princess Mother Memorial Park by boat. Take the Chaophraya River Express to the Memorial Bridge Pier. Walk across the old steel-girder Memorial Bridge to the other side of the river. The stairs up to the bridge are right across the street from the pier. When you get to the other side of the river, take the stairs down to river-front and follow the road around to your right. You'll pass under the other bridge and up the street a short way. A road will lead off to your left. Several green directional signs will point the way, but none of them are in English. Take this road all the way to its end and turn left. The Princess Mother Memorial Park is just a short way down this alley on your left.