Along the bottom, you will find a brightly-colored Nessie face and get a photo of it. Bring it back to the pub where it is revealed to be a movie prop.
When you have the submarine ticket, click on the sub (enter) and he will ask for your ticket.
There does not seem to be a horn on Cryptids Island. There is a flute (a pennywhistle) which you receive after the submarine ride, after you defeat the sore loser at darts again.
If you use the sub, I think you will find/see? Nessie.
first you have to ride the boat then go to the pub then you ask the guy in the blue then you will get it.
A gorilla
The Pub is to the right of the loch at Loch Ness. You will play darts there to win the tickets to the rowboat and submarine.
You win at darts a second time and get a submarine ticket.
Go on the submarine. You have a ticket. Dive to the bottom and then go left to see a Nessie face in the darkness. Take a photo and go back to the pub with it.
On the submarine tour, dive to the bottom and you can photograph a colorful "Nessie" head. But when you take it back to the Pub, it turns out to be a picture of a movie prop.
He is not on Cryptids Island. He is on Counterfeit Island.
Go downstairs and to the right, to the Cryptids Museum in the mansion. Look at the 5 videos of cryptids, and Mews will return to give you some instructions.
look at the door in the bathroom :)