(CNN) -- It is a surprising scene -- a picnic-like atmosphere with children playing in the pool under the tropical sun. The adults are also in celebration mode. The crowd is listening to a couple of rappers and some people dance to the beat. But this is not a park or a recreational facility. It's not somebody's backyard either. This is pavilion 1234 at one of the largest correctional facilities in Venezuela: San Antonio Prison. The prison is located on Venezuela's Margarita Island, also home to a popular beach resort that attracts international tourists. Carlos Nieto Palma, a Venezuelan human rights advocate, says San Antonio, located in Nueva Esparta state, has become a recreational facility where you can find anything from weapons to drugs and alcohol. Inmates allegedly even have access to cockfighting rings and prostitutes, but that's not the most shocking part.
@highlight
A human rights advocate says San Antonio prisoners have access to weapons and drugs
@highlight
Prisoners were recently allowed to open a 600-person night club, Carlos Nieto Palma alleges
@highlight
But a Venezuelan government spokesman says claims of the prison discotheque are "a lie"
@highlight
A prisoners' rights group says jails are overcrowded and that violence is common
Read more: @placeholder prison standoff comes to an end [2011]