Content aware fill came in at Photoshop CS5. If you google these terms you'll see all sorts of videos on it. You can select an area that you want removed, like a trash can in a park. Select that trash can with a rectangular selection tool, leaving some room around the can. Then click edit menu, fill, and chose content aware fill. Photoshop will analyse the area around the selected area and do it's best to heal the selection away. Sometimes it does a great job. Could this with a layer mask and you're all set.