I can't offer any information, but I've been for the night once.
It was a "Despedida" day/night/day arranged by other people. I was given an address and which "Colectivo" boat to take. My ex figured it out from there.
Some people had been there all day swimming and cooking copious amount of dead cow. We arrived as the sun was setting, nibbled well done cow & chorizo, were bitten by a bunch of mosquitos, hooked up in the shower, and then slept with covers pulled over our heads and a fan at the foot of our inflatable mattress.
In the morning we packed up asap to get away from the mosquitos and the coming storm. Then we cruised around San Isidro and that's all I have to say about that.