We arrive in Rio for one day on Saturday, December 7th 2013 during our cruise to Santos. We prefer taking the Metro rather than taking taxis in whatever city we are visiting. So, we would like to walk from the cruise terminal to the Boite Station and then hop on the train to Ipanema. How easy is this to do and return later the same day back to this station? How does one pay to enter onto the train platforms? Is a transfer to another train needed? Is walking in the Centro to the station on a Saturday morning recommended?