BootsnAll Insiders

My buddy and I are planning on flying into Buenos Aries and spending the last two weeks of February seeing the country. We're interested in spending half our time checking out some natural wonders and taking part in some cool outdoor activity. We're also looking to hit up the club scene in Buenos Aires or other hot spots around. Would taking 5 days to fly to Rio de janeiro make sense? Neither of us have been to South America and looking to see as much as we can at a medium pace. It sounds like an apartment in BA would be the way to go to? How convenient/cheap is bus travel through the country and to Brazil or Uruguay? Thanks for any input