Pha Deang Mountain Rock Climbing

First get to the west town. If it is dry season you can take any number of the suspension foot bridges. Go all the way across, not just to the little peninsula with all the bars on it. During the wet season they take down the foot bridges so you have to head a bit south to the big vehicle bridge and pay 4000 kip (50 cents). Follow the road around right until you get to the Maylyn Guest House and continue on for 200 yards or so until you see the mountain on your right, and white flags on bamboo poles in the rice paddies or a blue sign for  "cave, viewpoint" leading across the rice paddies. More than likely you'll be swarmed by a gang of kids there to collect your 10000 kip to go see the cave.  Head across the rice field, trending left, towards the obvious large wall.
Here's the gate crossing, and the hooligans who will no doubt be there to collect your money.