Hi @Kmckeown -- your seminars sound great! I think that the microscopes and Babylegs would be a great fit for something like this.The 3D printer and lasercutter should especially come in handy if students are interested in customizing or modifying any of their tools (the microscope is a great place to start if you want students to start exploring their own improvements/hacks/etc-- there are some interesting questions about set-up, orientation, light sources, etc that I think kids would be pretty great at finding answers to).
We also have a simple sensor called a Coqui https://publiclab.org/wiki/coqui, which is easy for people who are brand new to electronics to assemble (there's no soldering, coding, or computing, just components that can be assembled according to instructions), and it can be customized with some very simple tweaks.
The aerial mapping kits have been used with younger people quite a bit (balloons are great if you have access to helium, want to stay at a reasonably low altitude, and are working on a day with little to no wind, while kites are a lot of fun to learn to fly and can be flown much higher). It's easy to set up an inexpensive point and shoot camera to take pictures of the ground, and then you can use the photos to create maps and learn a little more about their environments.
We've also used our Infrared cameras and filter kits to investigate plant health-- using the DIY kit to convert an inexpensive camera to an IR camera is a pretty straightforward activity that others have used in the classroom as well.
Also, we LOVE it when students share their work with us online, so if you are interested in having a place where your students post about their projects and research-- we're all happy to jump in to answer questions, provide feedback, suggestions, support, etc.
If you want to speak directly with anyone at the store, you can reach us at firstname.lastname@example.org. I suspect that others will also be able to hop in with some good suggestions about Public Lab (or other) tools/methods that might be a good fit for your students.
Thanks for sharing! Looking forward to seeing what kind of projects you put together!