A group of friends and I are trying to plan a weekend trip to the beach. We're all a bit new to Argentina, so if anyone has any advice about where to go it would be appreciated. We would most likely leave early Saturday and come back late Sunday. I know Mar del Plata is an obvious one, but I've also heard Pinamar (?) is nice and closer. We're all in our early 20s and can't afford to spend too much. Really we just want swimmable water. Any suggestions?