Rumit P.
Yelp
About a 20-minute drive from the Nantucket Downtown District area.
If you have access to a car while visiting Nantucket, stop by the Sankaty Lighthouse. It was nice that it wasn't crowded, and the walking path is easy to traverse. There's a fenced area over by the bluffs that has nice views of the beach and ocean. There's signage indicating some facts and history. You can't go inside the lighthouse, as expected, but you can't walk right up to the front door, which is kinda neat.
Expect to spend about 30 minutes here, mostly with a smooth drive. AT&T cell service is limited so screenshot and directions in case you're out of range of internet coverage!