Although it may look or sound like it can get boring just sitting in a car driving. Think of it this - You get to bond more with your friend(s), see new scenery's (such as when I drive through Jasper, it is such a beautiful sight with the mountains), There are a lot of road trip activities, or create your own fun activities to keep things entertaining.
License plate game, I Spy (might be a kiddy game, but all these games can accommodate your own variations) Such as, the License plate game, you can instead of trying to find all 50 states (which is a lot harder than it sounds) Example: if a car drives past you with three letters 'tic' in it, you have to try and name off all the words with 'tic' in it, like Fantastic, pathetic, ecstatic... you get the point.
What are some your variations of Travel games?
My List below trying to collect ALL 50 states during my road trip to Florida from Louisiana...
Challenge, can you get more than me?