We do a 13 hour drive to Colorado every year with our boys, now 6 and 8, and this year will add a 5 month old girl to the mix. We are blessed to have family waiting at the other end, so we leave around 7 PM and take turns driving all night, and they wake up in time for us to hand off to grandparents while we nap.
We stop in Amarillo on the way home for ,in a sense ,a mini vacation (and to break up the trip instead of driving overnight). We stay at La Kiva hotel - cheap but clean with an indoor pool (the highlight) and breakfast, and the other biggie - a free "limo" ride (in a stretch cadillac with longhorns on the hood to the Big Texas - the Texas cliche Texas tourist trap of a restaurant where people try to eat a 72 oz steak within an hour to get it for free, singing cowboys serenade the tables, and you can get fried rattlesnake and rocky mountain oysters for an appetizer!
I love the idea for the light sticks - I think we will add that to the overnight trip this year! I've seen them cheap at the dollar store. We also let the boys pick out a couple of new books at half price books, or the library, and the DVD player is our best friend. If you look up locations before you go, you can rent DVD's at a Red Box here, and drop them off at any location in the US (they are mainly at McDonalds and Valero gas statins, but also Krogers, HEB, and some other spots). Blockbuster has kisoks too, but not as many (there is one in Denver, here in Tom Thumbs)