Please take note of MAOKONG GONDOLA'S operating hours. They might differ and might also get cancelled depending on weather. Better to go back earlier than later as winds could sway the gondolas a bit.
You could reach Maokong by taking the Metro towards Taipei Zoo station. Around 350 meters, walk to the Maokong Gondola Taipei Zoo Station. Usual operating hours is from 9am -9pm but could open and close at an earlier or later time depending on festivals and holidays. Best to check http://english.gondola.taipei/ for any announcements and news.