When is the Yishui Underground Grand Canyon in Shandong suitable for rafting?

The main problem of meeting the landlord is that he is afraid of the cold. In fact, the main landscape of Shandong Underground Grand Canyon is still in the cave, with constant temperature 18 degrees all year round. It is absolutely warm in winter and absolutely cool in summer. It's cold outside in winter, which is definitely more comfortable than you think, and it's cooler in summer. If you drift, whether in winter or summer, the water temperature will never make you feel cold, because there is an external environment to mark. If you travel, you can do it in spring, summer and autumn, especially when flowers bloom and willows are green. The scenery outside is beautiful, and there are many strange stones inside, which is definitely the best travel experience. In summer, it's absolutely great to spend the summer in a cave.