Get to the location on the map within the park and find the area shown in the bottom pictures. Go the the bamboo forrest and walk inside on the iron bridge (there are 2, find the right one). At the end on the marked area you will find what you are looking for underneath the leaves.
Note that the park closes at 6 PM
It is protected by a heat sealed bag, open it and inside on the back you will find a code. To mark this treasure as found, please send an sms with this code right away to the included phone number. Have fun and enjoy the hunt!
(if you have made it to the location but not found your treasure get in contact via email for help)
GPS: 48°11’27.3″N 16°22’59.5″E