The whole Wavel area is open for free, and it’s worth walking around and getting orientated with the day before you want to visit the interiors if you can. They have moved the ticket office onto the slope up from Ul. Bernardynska. There is an indicator board to tell you how many tickets are left for that day, and it drops by large numbers as the guided parties collect their tickets. Eentry to the Royal Apartments is by timed ticket, and the rooms are always uncrowded. You can go free on Monday between 9:30am and 1pm, but go EARLY, or else you won't get in. You buy tickets for the cathedral from an office just opposite its entrance.