Good question. I haven’t done a lot of work with science classes in a while so I’m not sure I have a good answer for you. As a computer modeller, I have gone to work with students and brought some marine data sets trying to help them link things like temperature, nutrients and phytoplankton growth, for instance. I hope this gives the students real world example of why we collect data and how it can be useful.
More importantly, what kind of experiments do you like?