I was in mar del plata several weeks ago for the long holiday weekend. I had a great time. the town is alot less expensive than ba, cleaner, and i think safer. lots of nitelife on weekend if u are into the club scene. mar del plata is off the tourist (foreign) track, which i think is a good thing. interesting to see how Args spend their holiday. As for the beach scene, being an old calif beach guy, went to UCI, I can say the beaches compare quite fav to calif beaches, in some ways better. weather is subtropical, water not so cold, lots of sun. you want to check out the beaches away from the town center, around the lighthouse are where the young hip crowds go (eg balneario mariano) and a few ks further south the beaches become more sparesly populated and picturesque.