🚇 Take the subway to Nakajima Koen St. The station exit is right inside the park.
I didn't have time to explore the full of this sprawling park, though to be honest the big pond is pretty but not that memorable. If you are pressed on time, head to the north-west corner of the park, where the hidden gem is a traditionally styled Japanese garden.
Overall, I preferred Maruyama's atmosphere (I cannot stop thinking about those ponds).