I would certainly plan on several months in the Costa Verde region, between Santos and Rio de Janeiro (which includes Ilha Grande), more than 300 islands, see the old town of Paraty. Not alot of wind during the summer but wonderful cruising.
You can pick up an English
cruising guide from the following link
Rapunzel - Publicaes
don't forget Carnival in February (and not just Rio, the locals believe it is is best in Salvador BA) one great party.
You can see one couples experience cruising the coast on
look in their 2009 & 2010 blogs. Noonsite also has some useful info on Brasil.
rules allow a yacht to remain in the country for up to 2 years, but visitors can only remain for 180 days in any 12 month period, whilst out of the country you effectively leave the yacht in bond at a ceretified marina.
If you would like more info send me a PM