I have raved enough about Amelanchier -- both A. arborea and A. canadensis -- that I don't really need to make this a long post.
But I did need to point out it's terrific fall color.
These are from one of my favorite parts of Battery Park -- it's the Cove area, which is just near the southernmost tip of the park. That's Gleditsia bark in the foreground.
Serviceberries aren't always yellow -- some specimens have an orangey-red fall color and some are even darker red.