From the mountaintop monastery, go left and down the ladder. Then go right, across the rope bridge, and climb down to the camp and the helicopter.
In the monastery.
On Cryptids, you go to the Himalayas and ask for the Yeti skull. He will not give you it, but you will be handed a lantern to 'light your way' as he claims.
Climb up to the first snow-covered level, and go left, and he will meet you.
If your avatar was on the island for the Preview, you have to leave and come back to play the island.
It isn't there. You have to go to Loch Ness first. Get a camera there by helping the man with his truck (click the left side, click and hold the valve stem on the tire). Leave the Himalayas by the rope bridge to the right of the monastery. You can get back to it the same way, from the helicopter.
Climb up and go left. He is just down the trail at upper left.
At the monastery in the Himalayas. You also need the matches from the pub at Loch Ness.
You have to look for Bigfoot/Yeti in the Himalayas, the Jersey Devil in New Jersey, the Loch Ness Monster in the Loch Ness in Scotland and the Chupacabra in Puerto Rico.
There are matches in the Pub at Loch Ness. Go right from the loch and they are on the bar in the Pub. You will need them for the lantern you get in the Himalayas.
You need the lantern from the Himalayas, and the matches from Loch Ness, so that you can travel in the dark forest at New Jersey.
Go back to the Himalayas, and now you can climb a rope at the right side (above the helicopter), and go back to the monastery for the lantern.
The head monk is in the monastery in the Himalayas. There are others, including one above the monastery who tests you before you can pass.