Hotels in buenos aires?

Question

I'm doing a spanish project and need to look for nice hotel on two of Buenos Aires's beautiful beaches. Does anyone know of any hotels located on any popular beaches?

Answer 1

Actually, Buenos Aires doesn't have any beautiful beaches.  

Mar de Plata is several hours south of Buenos Aires, and is known more for it's beaches--but only  a few months out of the year.  It's not a tropical climate.