Has anyone tried buying a two-day ticket on Ctrip and then upgrading to an annual card? How much extra does it cost? How is the fee charged?

Cannot directly upgrade, can only cancel the ticket and purchase an annual card. As for the two-day ticket, stay at the hotel, and if you feel tired, go back and rest for a while. It will be much more comfortable. No restrictions on entry and exit次数.
Cannot be upgraded directly, can only cancel the ticket and buy an annual card. As for the two-day ticket, stay inside the hotel, and go back to rest when you’re tired. It will be much more comfortable. There are no limits to the number of times you can enter and exit.