All of the people you meet in Puerto Rico are farmers or herders. Everyone seems to have goats, and the Jeep owner's brother raises chickens.
On your second visit to Puerto Rico (the first time you get fur), drive your jeep to corral three spotted goats into the clearing at the center star, Snaggletooth Rocks. Once they are there as bait for the chupacabra, get out and meet the farmer who is setting his trap.
You find it caught on the fence of the farmer's brother.
The farmer at Puerto Rico lets you use it when you arrive there.
There are several. The main one is the farmer that lends you his jeep.
Get out of the jeep and join the farmer, who has already set up the trap.
Talk to the farmer who rescues the balloonist at Puerto Rico. He lets you use the jeep whenever you are there.
He is not on Cryptids Island. He is on Counterfeit Island.
In the monastery.
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.
there are no tickets on cryptids island try counterfit island
You cannot buy or get chocolate on Cryptids Island.
Yes, you can find proof of The Jersey Devil, Bigfoot, Nessie, and the Chupacabra. (see related question)
There is no vent room on Cryptids Island. There are vents on 24 Carrot Island.