Caiobá‎

Postmarked Itatiba (a part of São Paulo), dated 13 April 2009.
Caiobá‎ - Matinhos
Vista Aérea da Praia Mansa
Paraná- Brasil

I have been able to find out very little about this place.  It is in the south of Brazil, not far from São Paulo.  I believe it is primarily a summer resort which, to all intents and purposes, closes during the winter months.