Make small cardboard games for each child. Cover the cardboard with clear contact paper or get them laminated for a small fee at a local printer. Use packets of stickers for games needing markers. A pack of colored circle office stickers is cheap. Remember to clean up after yourselves in the car, plane or train. Here are ideas for some games.
Even though you may not want your very own snow cone empire, the point above can apply in a different way. This business model allows you to operate it in addition to your regular job. If you work a normal 40 hr/week job as many do, then this may be a great part-time project. Once your stand is up and running it shouldn’t too difficult to hire kids to work during the day and then you can handle the other work at night. My most recent snow cone stand had high school kids work during the day and weekends, and i split the profits with a friend for him to make ice and syrup, pay the rent and payroll, and make deposits. I was running this business putting in less than 5 hours per week.