​From the Hang Dong Big-C:
Going south on the Hang Dong from the airport.
Turn left (east) onto the ring road.
Just before the Ping River bridge, take a left off the ring road.
At the end of the road , turn right (south) onto the river road.
Drive south for 1 km. At the 7-Eleven, go straight through the small four-way intersection (don't follow the river). 
There is a small outdoor market on your right

The Final Stretch: 
​Drive for 400 meters along this road. Don't worry if it curves—that's the correct path.
You will reach a four-way intersection with a small bridge. A two-story green building will be in front of you.
eSTAR Foundation is located across the street from the green building.
Go straight at the intersection for another 50 meters. (Ignore the small three-way intersection—stay on the main road).
The gate to the eSTAR parking lot is on your right, behind the building