The main attraction in Xindian (新店; Xīndiàn), a sprawling largely residential district in the southwestern corner of New Taipei City, is Bitan (碧潭; Bìtán; Green Lake), a stretch of dammed river famous since the Japanese era for its grey-green waters and rocky cliffs. There is something tender, lush and romantic about the landscape here and it draws in the crowds on a sunny weekend. It's wonderfully empty on chilly, foggy or rainy days, as well as mornings and winter weekdays.
Bitan sits right across from the Xindian MRT station as you exit (head left). A pleasant wooden walkway hugs the lake. There's a cycling path (that links to Taipei city), bird-shaped pedal boats, hiking trails leading into the misty hills, and the impressive Bitan Suspension Bridge.