Sorry best car in the game is the tank(not so much a car though).
By the way i read that it is possible to fly in a helicopter or plane(dodo). Furthest i got in a dodo was of the multi storey car park and even then it didnt fly far,more like it just took longer to drop.
there is none of that on the second island, but on the first island there are two. The first is where you have to put the cars in the garage and the second is a yellow striped area on the ground underneath one of those lifts in portland docks. They pay you money for police vehicles like the police car, ambulance, fire truck, etc.