To be accurate, I didn't get to Van Cortlandt Park a new way, just back from it.
I've found that the subway early on a weekend morning is fine. But coming home later in the day, it's more crowded. And there are always multiple people - in every car - not wearing a mask.
So I took the 1 train up to VCP and hiked to my trail section, which is at the northern end of the park. Afterwards, though, I walked out the northeast corner and over to the Wakefield Metro-North station. The Harlem line train is twice as fast as the subway, and thanks to the conductors, people are all masked. The two downsides are that it costs a bit more ($4.50 more), and that the closest stop is still two miles from my place. I can afford the cost, but not everyone can.
It was a beautiful day, weather-wise; I was in a t-shirt (in November!). After the park, which was its usual nice self, I wanted to visit the Wakefield Ave. bridge. It's one of the few pedestrian-accessible bridges that crosses out of NYC - in this case, along the very messy portion of the Bronx-Yonkers border. The border follows the former course of the Bronx River here, rather than its present one.
The bridge itself is long, spanning the river, a parkway, and multiple railroad tracks, but not particularly interesting. The Bronx River as it passes under is inaccessible here, trapped between the parkway and the MTA tracks. But it (quite conveniently for my purposes) has a pedestrian staircase down to the Wakefield train station.