Help Me Get Out of Kentucky!

I didn't purchase the Brains on Bikes game until after Gu and I cycled across America but it's proving to be more difficult than I thought. I am stuck in Kentucky. Hey I am not putting Kentucky down but I just can't get the 420 points I need to move on. Help. Is there a tip someone out there can give me? It's driving me round the bend. I cycled it now I want to game it! Anne