We are picking up a rental care at Boston Logan on June 9th to spend 3 nights in Hyannis. We were planning on driving down but thought we might return to Boston via the ferry from Provincetown - however I can not seem to find anywhere if this is in fact a car ferry or only for foot passengers? Can anyone advise? If there is a car ferry a) would we need to book the car in advance? and b) how often does it go back and forth per day and c) any idea of costs? We need to be back in Boston city centre by around 1pm on June 12th to drop the car back (to keep within our 3 day pre-paid rental).As we will only have 2 full days in Hyannis any suggestions on where we should go in that time? We are a family with two teenage boys. We would like to go to either Nantucket or Martha's Vineyard from Hyannis. Which would be best/quickest to get to bearing in mind the short time available? What to do there - hire bikes?? The second day we would like to tour some of Cape Cod by car - any suggestions would be great. Thank you.