How can I book a standard cruise of Li River leaving at Mopanshan wharf to yangshuo?

Generally, it is best to book the tickets in advance. If you will stay in a hotel in Guilin, your hotel can book that for you. Sometimes, the hotels also offer transfer service to the wharf for their guests. I heard the cruise will still operate that day, but no that sure. You'd better consult ur hotel. Good luck!