It's often interesting to delve into differing beliefs. A trip to Old Whaling Church is a great way to better understand one of the local religions and cultures.
You'll have no end of sightseeing choices in Edgartown. Old Whaling Church is an ideal place to begin here, but there are numerous other worthwhile sights to discover. Inkwell Beach, Oak Bluffs Town Beach, and Martha's Vineyard Museum are not far from the house of prayer and will round out your day nicely.