I always take things to hand quilt on long trips. I put one whole quilt together in the car, cutting too. After the trip my DH built me a box to put on my lap with a small cutting board glued to the top, so I could use a rotary cutter instead of scissors. He thought I might cut myself.
I like to work with diamonds.
Put a small sewing kit together, some squares or diamonds. Sit back, relax and you will be surprised on what you might end up with.