Demon of Paradise (1987)
A resort is terrorized by a half fish/half man monster. The resort owner does not wish to close and comes up with a plan to exploit the terror as a promotion!
https://www.imdb.com/title/tt0092870/?ref_=nv_sr_srsg_0
-
Lady Grey commented
This film manages to make both Hawaii (where it's set) and the Philippines (where it was shot) boring. Two countries, both known for having incredibly beautiful scenery and interesting culture, both made uninteresting. Then there's the monster. It looks like they spent all of their creativity and budget on the costume, then forgot to make it actually scary or intimidating. If someone were to tell me that this was made because the filmmakers wanted a vacation or to launder some money, I wouldn't be surprised.
It's easily riffable.