A tip for travel to and from Don Muang airport (DMK) . Take the Skytrain to it's most Northern stop : Mo Chit . Exit on the West side down to street level and walk a little way North to the bus stop for the A1 / A2 bus . This bus will take you to Terminal one DMK .
You can walk indoors to 'departures' Terminal two .
Returning catch the A1 or A2 bus and tell the conductor 'Mo Chit' and they will tell you when time to hop out . Then you can enter the Mo Chit MRT ( subway ) station or walk a little further to the Mo Chit BTS ( Skytrain ) station . Hopefully you will need to go somewhere near one of the MRT or BTS stations .