At Bonanza Speed Way (Khao Yai) entrance free.
From 10:00 - 24:00
See also https://www.facebook.com/photo.php?fbid=645585732158752&set=a.346797465370915.89944.345550898828905&type=1&theater
From 10:00 - 24:00
See also https://www.facebook.com/photo.php?fbid=645585732158752&set=a.346797465370915.89944.345550898828905&type=1&theater