In addition to the usual nightscapes, one of the things you will find yourself wanting to play with without even thinking about it is the creative mode. You can use any of them to easily bring out a different feel in scenes you know well, so you end up having so much fun shooting that you forget about the amount of time that goes by.
Even the nightscape shots that you knew must be hard are easy if you just know the right way to take them. You might want to try taking nightscape shots like this with the camera tucked away in your bag on your way home from work or school sometime.