We will be leaving Logan Airport by rental car this Friday around 9am. Can I just follow my Garmin onto the Cape? Did I read there may be trouble with a bridge and/or traffic? We will be staying at the Commodore Inn in West Harwich. This was recommended by my employee who grew up on the Cape. We'd like to ride bicycles and take a day trip to Nantucket or Martha's Vineyard. The weather report says rain on Sunday and Monday. Any suggestions, please?