Physical properties can be observed through the senses in many cases. For example, sight, texture, melting or boiling point, smell, weight. Sugar is white, soluble (dissolves in water), granular in texture and melts at 186 degrees Celcius.
Basically, a physical property is anything that can be observed without putting a substance through a chemical change. Among many others, a few physical properties of a spoonful of sugar include that it is white, has a grainy texture, and the grains are small in size. If you could calculate the density or boiling point of this spoonful of sugar, those would apply, as well. :)