WOW what a lovley place, Mar Del Plata is definatley where you should head if your looking to relax and unwind.
Here you can take wonderful walks on the long beaches or spend an afternoon exploring the beautiful sand dunes and cliffs.There are basically all watersports available such as jet skiing, diving, sailing and of course windsurfing.
Take a bike ride around town or go for a exhillerating horseback ride
Some of the most impressive attractions would have to be the Torreón del Monje, Barrancas de los Lobos, De los Padres Hill and Lagoon, Sea Museum, and Punta Mogotes.