In the Science Lab experiment Viscosity of Liquids we examine the properties of different liquids beginning with a comparison of corn syrup and water.
Most liquids are more viscous at lower temperatures.
The difference is very sharp with corn syrup. There is PDF file of the experiment that you may want to download and duplicate for distribution to your students. It includes a chart that they may use to record the data they collect. It is also a good idea to enter the data into a spreadsheet. You can compute the averages easily and use the data to produce graphs such as the the one below and the bar graph that appears on the results page.