There are some good maps available on the internet you can print off and work your problem over quite easily , i pieced them together and found that a good help when i first went to BKK . Taxis are very reasonable in cost but many do not speak or understand English well , nor can they read a map , i have a phone number somewhere for a lady driver which i will try to locate for you . Biggest problem with Bangkok ???? It becomes an instant car-park several times a day , at those times it pays to use a motor-cycle taxi should you be in a hurry . Hope this helps a little . Colin