This semester I incorporated a starting physics lab with preschoolers! I think that kindergartners would love it too. I created a water dynamics lab for the students to explore the flow of the water. They also used various materials and had 2-4 students at it at a time. To start the lab, I used a large tote and cups. Then I gradually added cups with holes, funnels, beakers, and eye droppers. I did this for weeks with the children and they seemed to stay engaged the whole time! You could do this with more elaborate materials for kindergarteners. Another idea would be to make a KWL chart to fill out before and after you have completed this. Students can create a drawing of what they have learned or journal. While they explore, you can ask them productive questions to spark their thinking of why things are happening. I had a lot of fun doing this with the kids and they enjoyed it as well. There was plenty of opportunities for investigating science!