I'm sure this thread is pertinent while many Spaniards and other Europeans are spending the entire month of August at the beach! I am going through some magazines that I haven't read yet, and the July 2007 issue of Conde Nast Traveler has an article about "Best Island Beaches." The only listing for Spain is Playa de las Salinas.
According to the article, "Every beach is a party beach on Ibiza, but this is the hippest." The article mentions that Playa de las Salinas is quite the party beach. And, if you want to "party where you sleep," stay at the
El Hotel Pacha . However, that's only if you have a lot of euros to burn!
Read the blurb about Playa de las Salinas
here .