You are looking for 'phat', the friendly neighborhood Tiger. Caught by poachers his sister died so the local community have built him a house.To get here you can take a taxi, bus or motor bike out to the waterfall. At the parking ground, pay the entrance fee to the park (2000 kip) and head up the track.
You will reach the enclosure. Look for the caretaker and ask for the 'kong'. He dosent speak much English but will understand the why you are here. In the 'kong' (actually a small sticky rice container) is notebook, pen and 20 Thai bhat. Please also consider a small donation to the caretaker - (20000 - 40000 Kip would buy a meal for Phat)
To claim the cache please upload a photo of Phat. Have fun!
Note on cache maintenance: The cache's caretaker understands what geocaching is about and will ensure that it is kept OK. I spend alot of time in the region on business and expect to pass buy and check at least every 8 - 12 weeks