After it was closed for around six months, the cycling track at Suvarnabhumi International Airport, now dubbed Sky Lane, is back in service.
 
The new refurbishment brings more rest areas, restrooms and snack stalls, making the 23.5km-long, high-quality track more biker-friendly than ever. Plus, there’s also a running track available for those who want to hit the ground on foot instead.  
 
Register at the gate with your national ID or passport to receive your free “Snap” device which grants access to the grounds.
 
Here's a video overview of the upgrades (Thai language):

Open daily 6am-6pm. Suvarnabhumi International Airport, 999 Moo 1, Nong Prue, Samut Prakarn. http://bike.scb/en