I need your help - what cars are these?

When I was on my ride through the USA last year, I saw and photographed two cars.  I want to refer to these in my book about the trip but I am afraid I don't know what they are.  Does anyone out there know?

I believe the lighter car might be a Chevrolet Impala, but I am not certain and I don't have a clue what the green car is.  I will be very grateful for any information!