Judgement Day is a rare gem of lesser known 80's horror staring Cesar Romero and Monte Markham. Two students on vacation in Mexico feel that they that wandered into a tropical paradise. Little do they know that they have wandered into Satan's lair. This movie was also known as The 3rd Hand when it was released in the U.K.
Trailer is here: https://www.youtube.com/watch?v=8nUnBTK6zGo
Movie is here: https://www.youtube.com/watch?v=2IWwFfIvrBk