I just spent four hours going to and from the radiology place in Yonkers to get my old films. Yes, the buses are less frequent on weekends. But this is why I wanted to do that, so from now on I can go to the West Side, and use up far less time. Three buses in each direction, one of them instead of a subway and incredibly slow for the first mile or thereabouts.
For reference: Yonkers is the city just north of New York. There are bus connections between the Westchester "Bee Line" system and NYC transit, and in fact the systems are sufficiently integrated that I can use my unlimited-ride metrocard on the Westchester buses as well.
On the other hand, the receptionist at the radiology place was helpful and efficient. Also, on the way up, I noticed a little bit of parkland labeled "Tail of Van Cortlandt." It's tucked in next to the street, just south of the actual Van Cortlandt Park; I suspect the nice plantings, benches, and names are all recent.