"Diversity" is a good word to describe Berlin. And there's no better place to get a dose of diversity than along the River Spree in Berlin. If you simply walk around the river banks near the Oberbaum Bridge connecting Friedrichshain and Kreuzberg, you'll get a dose of diverse artistic talent.
On one side of the bridge you'll find clever, colorful modern architecture, as many large companies call the river bank home. But if you walk along the other side of the bridge, you'll be mesmerized by the East Side Gallery. This is an open-air gallery, a section of the wall that is preserved along the Spree River—a place for street artists from around the world to leave their mark for peace.
In addition, you have the Oberbaum Bridge to take in and admire! And there are plenty of places to stop along the river bank to pick up a beer, sit in the grass, and soak in the sun, just like the locals do. Go spend a lazy afternoon along the River Spree.