The lights you can see in the left half of this photo are the lights of the Hartleyvale Stadium in Observatory, which is used for hockey and soccer matches. In the foreground you can see part of the Liesbeeck River, and in the background Devil's Peak.

Neither of us has actually ever climbed Devil's Peak - I believe it's quite a hike and you need to be pretty fit to complete it. "Fit" is not a state I'm often in, so this is one activity that's been put off quite a few times. :-)