Ferries to the island can be accessed from Hyannis, MA and cars can be taken to the island. Planes can also be accessed from US east coast airports but many only operate during the summer months. Boston is your best bet for year round air service to the island.
Nantucket is island 30 miles off the coast of Cape Cod MA. It is accessible ( primarily) by ferry. Taken from the dexk of a ferry as I left the island in October, the picture captures the town's fall colors and its surprising elevation. As a popular tourist summer spot the island's yar round population of 8,000 jumps to around 50,000 during the summer months.