we just got back from a road trip, and our activity bag for our 3 year old SAVED our trip. I found a couple things that kept her entertained for hours.

1. Melissa & Doug Water Wows (letters and princess one)
2. Melissa & Doug Magic Color book (markers only mark on book)
3. Face stickers - my mom found this, it's a bunch of blank faces and than you choose the eyes, lips, jewelry, ect. SHE LOVES it.

I also bought Zootopia and we played that for her on our car entertainment center. But we didn't want her just watching movie after movie, so other activities were necessary!