I'm going to be going to the middle of nowhere for a couple of weeks, and there's going to be no internet there.
I design with Figma and I code in React Native/ReactJS. How can I build something or learn a skill with no internet to make sure I'm productive over this time?
If none of that applies, and you still want to learn something to do with tech? Well, you know this won't be an ideal situation to engage directly with a system. How about zooming out a bit? Read some books. Some of Stallman's essays. Clifford Stoll. Or anything else more recent that you think is big-picture significant to your field. Your situation will be ideal for contemplation, which will in the long-term make you a better contributor to whatever projects you take on.