Of China's four sacred Buddhist mountains, this is the only one on the sea. Mount Putuo is a small island in the Zhoushan archipelago off Zhejiang, ringed by beaches and sea cliffs, and it has been the seat of Guanyin — the bodhisattva of compassion — since the Tang. People come to ask for a child, for wealth, for safety; monks come to bow their way up one step at a time; and plenty of visitors come with no belief at all and leave quieter than they arrived.
Its character is in the water as much as the religion: the surf booming into Chaoyin Cave, gold sand at Baibu and Qianbu, temple tiles among old trees, stone carvings on cliff faces. The island's own boast is that anything here — a house, a hill, a rock, a plant — carries the mood of a Buddhist country.
Physically it is easy but not tiny. There are no taxis; a shuttle-bus network links the sights, and the real reward is walking the coast and the stone paths between them. Give it two days and you cover the temples, the cliffs and the beaches without rushing; a third day lets you slow down, take the crossing to Luojia Mountain, and eat in the temple dining halls more than once.
It is reached only by boat. The mainland route runs through Ningbo and Zhoushan — coach to Dinghai or Shenjiamen, then a fast boat across — while Zhoushan's own airport at Zhujiajian is the other way in. Because ferries slow to a crawl in peak season, the relaxed version is to sleep a night on the mainland side and cross early.