I had to look up the word 'sidewalk' to make sure I understood what it was, as we don't have sidewalks here in Europe.  We have pavements.

Finding a different angle can be hard, but as you can see I looked down on the 'sidewalk' and managed to get the reflection of the building in the puddle. 

Whilst out and about today, try to look down and see what you find.  You will be surprised by what you can find to photograph.