Tap Mun, also known as grass island, is the best of the five islands for local culture and easy walking. The island is reasonably flat but has some great routes in the north of the island for walkers wanting to escape the crowds. Although there are no formal beaches, the waters are crystal clear and fun for paddling and rock jumping.
More information and a map HERE.
Starting at East Point, take bus 101M to Sai Kung Pier. Transfer to bus No.7 to Ko Tong then change to bus 94 to Wong Shek pier. After that, take ferry to Tap Mun Pier.