For toddlers learning the ABCs or for young children learning to read, play 'Alphabet I Spy.' Each player of the game has to find every letter of the alphabet in sequence on the billboards, license plates, cars, etc. outside. The only rules are that you must call out the letter and the source of the letter as you drive by, all the letters counted must be found outside your car, players cannot claim the same letters as each other - they must be unclaimed to count, and the first player to get to letter Z wins.
Create a daily driving journal describing how far the family drove, where to, and why. See Daily Journal Writing.