A horror movie.
1980s
Young adults, maybe teenagers go to a cabin.
A creature that is sort of like a lizard, serpent lives under the cabin in a cave.
At one point the creature uses its devil like tail to try to whip it a persona from under a car in a garage.
The characters find themselves in the cave in water and the creature is in the water as well.
The Boogens (198?)?
Totally agree with you Livinghead. I had been looking for this as well, and stumbled upon while searching for another oldie. lol there is a similar scene in the movie, The Unseen. I won’t say just in case they want to check it out too. Another awesome 80’s horror.
1981
Or maybe, wild guess. . . There’s Nothing Out There (1991)?
Graveyard Shift (1990)?