Print out lists of US states and get the kids to tick off cars as they see non-Florida plates. Worked well for us at Spring Break travelling around Orlando and Gulf Coast. Wikipedia has got a reasonable table of the States to print out.
That's a great idea, Tezza. Boredom-busting and education in one! As a family, we often (well, sometimes) play "name all 50 States". Take in in turns if you want to play. It's harder than you think!
