I went there in May. It takes at least 6 hours to have a good time in Huaguo Mountain. If it's too late. It is recommended to go to Kowloon Bridge by car and then to Yunufeng by cable car. Play downstream from the top of the hill faster. But it's also less fun to explore. Drinking water is not recommended. Water is not too expensive on mountains. The price is within the acceptable range. Better bring money, mobile phones or cameras, toilet paper and snacks.