Above is an embedded Youtube video of a walk around the top of the Gay Head Lighthouse. Below is a single panoramic photo followed by a grid that will show photos in a slideshow.
I would recommend visiting the Gay Head lighthouse and cliffs in Aquinnah if you visit Martha's Vineyard. It's one of the few places that actually has parking and there is plenty of room to walk around and take in great views. The view is even better if you take a walk up the staircase of the lighthouse!
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The second panoramic photo below shows the large open space inside of the parking loop. There are various gift and snack shops near the cliff overlook, and at the bottom of the hill is the Aquinnah Cultural Center.