Need some vacation tips to Oakbluffs (Martha's vineyard) Machusetts..?

Hi, Im very interested to visit the capecod region... and am thinking to take my family to the oakbluffs in MA for the weekend.. If you have visited this place or any place around the Martha's vineyard islands, pls share your travel experience with me.... we're planning to drive down and then take a ferry to the oakbluffs...but have no idea on the local transport there or the places to visit in and around the island...any tips particular to this vacation spot will be very helpful....thank you