Zhaohui Park is famous for its ginkgo trees. But not inside the park. There is a lane named "Huanyuan Lane" outside Zhaohui Park planted with ginkgos on the both sides.
Every late autumn (usually from Nov 15 to Dec 31), the ginko leaves turn yellow gradually and decorate the lane in gold and glitter in sunlight. The beautiful scenic make it one of the most popular place to visit in Hangzhou when in autumn. So if you come to search this cache during this peroid, muggles may be more than usual. But recommended if you like to enjoy the autumn.
NOTE: The google map has a large off with about 500 meters in China in the official app. But the satellite view in c:geo and gps match. So please trust your gps rather than the google map in offical app