Mar del Plata is on the southwest cost of the Argentinian sea. It is the second most touristic city in the country after Buenos Aires. You can go to Mar del Plata by plane, by bus, by train or by car. It is 400 km from Buenos Aires approximately. You can take route 2 if you are driving, but you must pay toll.
There are magnificent beaches, wide bays and wonderful cliffs, which alternate in 47 km of coast line. At night you can go to the theatre and then choose a good restaurant. If you want to dance, the city has several discotheques in the 'Playa Grande' area.