Friend, if you don't want to end up like me, spending four days only doing one one-way trips on the three cable cars and one elevator (walking up, cable car down, or elevator up, walking down), and walking around 20,000 steps a day, covering over 10 kilometers, leaving your legs exhausted by the time you get back to the hotel each day, then I recommend buying a round-trip cable car and elevator ticket. Play the way I did; I saw 90% of the attractions in the scenic area in 3.5 days. I exited through all four gates once (don't exit from the North Gate unless you're staying there).