Hey, dumbasses! The following is only my opinion, but given the poor performance of your little movie, I suspect I’m not alone.
The reason reality shows are popular is that you meet characters over a longer period of time and get to identify with and/or hate them, and grow to have relationships with them, just like in sitcoms and dramas.
One-off movies like The Real Cancun are bound to fail because there is no identification with the characters, the key to making the mundane seem exciting.
That, and having an ugly fat guy in the commercial wearing nothing but a Speedo and asking who’s ready to party may not have been the best way to attract moviegoers.