Before you go to the Himalayas, get the digital camera by helping the driver at Loch Ness.
You will need to climb the mountain to see the head monk at the monastery, who reportedly has a Yeti scalp. But unfortunately, he won't give it to you. He does give you a camping lantern. If you climb up to the top of the mountain above the monastery, you will find a footprint to photograph. These two items are all you can get from the Himalayas, so you will have to prove the other three cryptids.
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.
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.
The monastery is at the top of the mountain at the Himalayas. You can see the head monk there, and you can climb the trail above the monastery to seek clues.
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.