We went during Christmas-New Year season and the lines were long. I recommend wearing warm clothing like jackets, thermals, hand gloves, winter hat, etc., as it gets really cold here during this time. When booking tickets on tripadvisor, make sure to download the PDF ticket to your phone or take a print out. I did the mistake of taking the green color applet with barcode on it. It only worked at the entrance but did not work for skywalk. So make sure to download the entire pdf.