15 days in Buenos Aires was fantastic. We love to walk, so we spent many hours a day exploring the city. Palermo Soho with it's many shops and restaurants is a great place to wander. Graffiti throughout the city makes for a fantastic tour in itself.
Puerto Madera is a fun way to enjoy a quiet afternoon along the waterways, admiring the yachts, the people rollerblading, the many outdoor cafes and restaurants. If you keep walking along the water toward the nature preserve, there are a lot of street food vendors offering really tasty stuff. We saw it on the food network, and our huge sandwich topped with wonderful sauces cost about $1.50. There are very few tourists there, just lots of locals with their families. It is definitely worth a visit.
Every guidebook talks about the San Telmo Sunday market, which we did on our first visit. This time we decided to go and explore San Telmo midweek so that we could really see it without the crowds. There are incredible antique stores, resale shops, and lots of restaurants. We happened upon the penitentiary museum, which is free and fascinating. We also discovered (the smell beckoned us in) El Parque Pizzeria which had the best pizza we have ever tasted. It is a tiny hole in the wall with a red awning, so if you happen to see it in San Telmo - check it out.
We also happened to see the flag removal at sundown in front of the pink presidential palace. It was rather like the changing of the guards, with soldiers marching out and one trumpeter playing as the flag was lowered. Very cool to see.
If you have not been to the Tigre Delta, then by all means go. You can hop on a river boat for a tour around the many canals and islands. It is a fascinating thing to see.
We went to museums, shops, restaurants, markets, outdoor fairs, rode the subways, enjoyed neighborhood cafes and fine restaurants, explored city parks, ate lots of medialunas, photographed the gorgeous architecture, ironwork and carved wooden doors, explored the many polo and leather shops, and enjoyed every single minute.