The reason for the apparent time-warp that has held off the invasion of ugly development is the protected National Park of Prokopské Údolí. This is an area of forest and paths, perfect for walking and cycling and very popular at the weekend with locals and those who want to escape into nature without travelling far from the city. You can enter the park from either Hlubočepy itself, or from Nové Butovice, although I recommend having a map with you. For a good place to start, take the metro to Radlická stop (B line) and then head in the direction of the radio mast. From Děvín hill directly above Smíchov you have a stunning view of the whole of the city and the Vltava. It is a popular place for kite-flyers, picnics, and romantic walks. In winter, many people make use of the area for cross-country skiing, too. You can walk or cycle along the paths for a couple of hours, forgetting the city completely.