Hue is not a very big city and it is possible to walk everywhere. One of the best places to walk is along the An Cuu River. It is very scenic, the Ann Dinh Palace is along the bank , and there are also several markets located at the main junctions.
You can see street vendors everywhere at any time - morning noon or evening. They are mostly ladies, protected only by their Non La.
Grocery shopping is quite convenient in Hue - you don't even need to get off your bike.
How about getting a hair cut on the road side.