The best time to travel in Yellowstone National Park is from April to October. Almost all scenic spots are open, and July and August are the peak time for travel (summer vacation). Huangshi has a large temperature difference in the morning and evening, and strong ultraviolet radiation in summer. It is suggested to do a good job of warm and sunscreen measures. Yellowstone Park is relatively large, and the attractions are scattered. Self-driving tours are more free and free, and there are newspaper tours for a day or two. There are four airports around Huangshi. The airport has car rental service. Each company and the price of driving vary. You can go to the official website in advance to know that the domestic driver's license can rent a car in the western United States. The handling fee will be more expensive, and the navigation system will be calculated separately. According to their own situation, parents can formulate a set of suitable for themselves, and the price of each airport will be different. The parking fee for each car is $50, and it can park two parks (there's a Grand Teton National Park nearby). Yellowstone has many natural wonders that can not be missed, such as Old Faithful Fountain, Upper and Lower Geysers, Big Diamond Mirror, Mammoth Hot Spring, Lower Falls, Thumb Basin, and a variety of animals.