We had a "scavenger hunt" on one bus trip. It wasn't announced, so no one could pack the kitchen sink LOL. Get a list of things like a safety pin, toothpicks, different colored pens (green, pink, purple, etc.), Sharpie markers, pigma pens, hard candy. As you call out the item, each person gets a point for each thing she has that is on the list. It has to be something in their possession when they boarded the bus. Have a small prize for the person with the most, least, and wierdest. I won that one because I had a pair of chopsticks in my purse -- hey, they had it on the list. Include some easy things like chocolate, a phone, book (or electronic reader), magazines, bottled water and some not so easy stuff like a hard boiled egg (we had to pack our own lunch and eat while the bus was moving), hair bow, rubber band, band aid. The list goes on and on.