Will be arriving in Guiyang around End June 1-2pm and visit Huangguoshu and Dragon Palace Cave.

It will be very tight to cover these two places in one day. So if you just have one day in Anshun, you may go straight from the airport to Anshun Directly. You can take a direct bus at the airport to Anshun at the cost of CNY60/person. It operates from 09:30 to 20:30 with the interval of 1 hour. This bus will arrive at the opposite of Anshun South Railway Station. Then you may transfer the special express to Huangguoshu Waterful Scenic Area. Upon arrival, you may visit this scenic area in the afternoon. Huangguoshu Waterfalls Yingbin Hotel located near the scenic area will be a good choice. It charges around CNY450-600/night for a double room. You can continue to visit the unfinished part of the scenic area on the early morning of the next day. After that, you may continue your trip to Dragon Palace Cave.
If you want to take the train to Anshun, you don’t need to book the ticket in advance, because there are lots of trains one day.