Royal Hong Kong Yacht Club
Hynes was then appointed as the unofficial member of the Legislative Council in 1927 and the Executive Council of Hong Kong in 1928. Among other public appointments he was a member of the committees of the Hong Kong General Chamber of Commerce, the China Association, the court of the University of Hong Kong, the Matilda International Hospital and the Alice Memorial Hospital, and Seamen's Missions. He was also a steward of the Hong Kong Jockey Club and vice-commodore of the Royal Hong Kong Yacht Club.