If you are on the expressway, take the
port exit (on the way to Bang Na) and turn left then left at the next lights.
If you come from Rama IV Rd turn right at the lights
at Kasemrat Rd (Tesco Lotus on the corner) and then continue until the next
lights and turn right.
If you come from Rama III Rd, technically you can't
U-turn along Sunthorn Kosa Rd so you may find yourself having to drive into the
Port before being able to turn back. Probably better to go to Rama IV
road and following the instructions above.