Definitely do a Tango show and dinner. Have your hotel arrange it for you ahead of time. Ladies will love it as well. Shop Florida Street. The leather goods are superb. Check with your concierge for the best restaurants near your hotel. Argentina is the land of steaks and Malbec wines. One somewhat odd site that is really worth an hour or two is to wander through the Recoleta Cemetery. You can even put a flower on Evita's tomb (Eva Peron).Going in March
Any suggestions for things to see in BA?