Question : Have you considered flying out of an airport besides Santos Dumont Airport (SDU)?
Answer : Lucky for you, there is another airport near Rio De Janeiro. Galeao Antonio Carlos Jobim International Airport (GIG) is eight miles away, and over the upcoming two months, flights are being priced 30% cheaper than flights from Santos Dumont Airport.
Question : How long do most people visit Miami?
Answer : Of course you're not most people, but if you were, you'd stay roughly 15 days.