We plan is to finish up in with the tourist scene in Plymouth around 5PM and drive to Cape Cod where we wil be spending a couple of days. Mid-July on a Wednesday. In looking at the map, the main route would be 3, but an alternate could be 3A. For one who has never been and may never be again, which of the two would you recommend? It looks like 3 is the main way and is shorter, but would 3A be more scenic? Thank you.