We are heading down to the Cape for 4 days in mid-July. We have an energetic and easily bored 3 year-old with us. We will be staying at Ocean Edge in Brewster but wouldn't mind having some other places to visit for half-days or full day excursions. Would MV or Nantucket be worthwhile? Can we easily get around the islands without cars or do we need to bring our car and reserve a ferry? Also, kid-friendly and Cape-unique suggested restaurants are greatly appreciated!