Lumpini Park is fifty-eight hectares of grass, lakes, and Albizia saman — the rain tree, that wide, umbrella-shaped legume planted across tropical Asia in the late nineteenth and early twentieth centuries for exactly the reason it does its job here. A mature rain tree has a crown twice as wide as it is tall, and the older specimens along the Lumpini perimeter, planted in the 1920s when the park was a royal gift, are now thirty meters across. The interior of the park has mixed cover, sometimes thin. The perimeter, the 2.5-kilometer loop along Rama IV, Wireless, Sarasin, and Ratchadamri, is a continuous green ceiling.
The picks below are the perimeter, in segments, plus two short interior connectors. They are graded for the hours from about 9 AM to 2 PM — the part of the Bangkok day when the central business district sidewalks read as physically dangerous and the park reads as the only place. A practical note: the monitor lizards on the lake banks are not dangerous and they will not chase you; let them go first across the path.