Nicole Kopf, an East Hampton resident who died in March at 81 and bequeathed $375,000 to the Town of East Hampton for its services for senior citizens, enjoyed visiting the town’s senior center on Springs-Fireplace Road, her sister, Eileen Berets of Stamford, Conn., said this week. “I’m sure she felt that she wanted to support it for the future,” Ms. Berets said.