Taking the stairs whenever you have the option is a great way to burn some extra calories throughout your day. Also, when parking your car, park as far from the door as you can. This will help you to walk more then you normally would, without putting too much effort into it.
If you enjoy watching television, try adding a little workout to your TV watching. Watching TV while working out may help you forget that you are working out, which will increase the length of your workout. Try using television shows as a timer. If you know that a show runs for half an hour, tell yourself that you will work out for two shows.