Even for a short, evening walk to the the near-by shop which is open till 10pm it’s worth to take camera with you. There always can be something interesting worth taking a photo.
Below you can see some photos taken with EOS350D with Canon EF 50mm f/1.8 II attached – of course because the night mostly maximum ISO1600 setting was used – and this setting in that old camera is usable only with b&w profile, only then such grain is acceptable. As you can see below, the entrance to the metro is especially interesting for a night photos.