How do you unlock the dumpster on cryptids island?

You can find bolt cutters at the top left star on the map in Puerto Rico. If you drive there, go right and climb the poles to reach the top. At New Jersey, cut the lock on the dumpster and take the junk door into the restroom. This will provide driving directions.

Before going to New Jersey, you need the matches from the pub at Loch Ness, and a lantern from the monastery in the Himalayas. Otherwise, it is too dark to get off the motorcycle.