There are two parks there, Zhongzheng Park in the front park and Yangming Park in the back park. The interesting places including the flower clock is in the back park. Dec is not a good time to see the flowers. The flower season comes since Feb. When you get to the Yang Ming Bus terminus, take the 108 sighseeing bus inside the park to Yang Ming Studio, 阳明书屋. The flower clock is just nearby. Next stop is 竹子湖, there is restaurant here.