Nudist Colony of the Dead (1991)

Nudist Colony of the Dead (1991)

Judge Rhinehole orders the Sunny Buttocks Nudist Camp closed down as
an affront to the community. The members of the camp enter into a
suicide pact, but vow to return for vengeance. Five years later, a
group of campers on a retreat argue with each other about religion
and sing big production numbers as the group begins experiencing
an attrition problem.  (IMDB)