The time spent in Sydney is quite rich, and I suggest you must expand to the surrounding area. Activities such as Watson's Bay and Wollongong Skydiving are popular among Chinese and foreign tourists. Personally, Australian skydiving is not particularly expensive compared to other countries, and can be used as a reserve option. More people will choose a day trip to the Blue Mountains, about two hours drive from downtown Sydney. I and my little friends will not drive by themselves, so I took a day trip to the tour group. The bus will pick up and drop off at the address, especially for individual guests. [When you book a day trip or similar event, you must arrive at the meeting point on time, especially in countries with strong time concepts, starting on time and not waiting for someone. The famous Three Sisters is the perfect location overlooking the entire Blue Mountains. It is a pity that it is cloudy, there is no way to see this magnificent scenery too clearly. The trip to the Blue Mountains is to visit the Jenoland Cave, the oldest open cave known in the world. Some people in the same trade participated in the climbing cave activities. We thought that it was inconvenient to take pictures and gave up. Follow the guide in the hole, all kinds of strange stalactites will definitely leave you a deep memory. The tour guide led the group members all the way, the cave was dark, and every time we visited a scenic spot, the tour guide would light up the lights in one area. If you walk in front of the front of the guide, every time you see all the lights in order, it feels a bit wonderful. All kinds of rocks are so strange in the erosion of water, and the lighting is even more mysterious.