This is how I cut up a watermelon, although if it's larger, I'll cut it in half to have a stable surface while cutting off the rind. The post from Fifteen Spatulas also has a delicious recipe for watermelon-lime slushies.
Make your own lunchbox icepacks from dollar store sponges soaked in water and put in ziplock bag. When they thaw, the sponge absorbs the water. Good idea for a picnic. Once they thaw can use the sponge to wipe up messes.
Learning to drive the car first is key... Then the very next set of skills you will want to learn is how to maintain that vehicle and How to Jump Start a Car might come in handy for you or anyone else you come across in the future of your driving life.