It is at Loch Ness.
They aren't arrows, they are darts (see the related question).
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.
you have to go to the pub and beat the man who doesn't belive in Nessie at darts
check it out on youtube......just search for 'zapak darts' in youtube.....n der is a video der on how to hack 'multiplayer darts' wid cheat engine.... P.S THIS IS ONLY FOR MULTIPLAYER DARTS!!!!!!!!!!!
Nothing, apparently. However, he gives you the pennywhistle when the darts player is a sore loser.
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You win at darts a second time and get a submarine ticket.
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.
On your first visit to Loch Ness, you can win a rowboat ticket by playing darts at the Pub (to the right of the Loch).
the man who first challenged you will come back and demand a rematch so basically that is what the blue darts are for
you battle that guy that you battled before at darts and you deafeat him at darts and then you the barman gives you a pennywhistle then you go to the rowboat and go left 3 times and then you use your pennywhistle and Nessie cmes out.