| Botanical Gardens has its own Metro-North stop on the Hudson Line. There's nothing direct from where you are. Best bet would be to get to one of the stations on the Harlem line by coming east and then just taking the train to and from. Here's the map Otherwise, you can come into Grand Central and go back and forth from there but I think the other way is more efficient. |
Here is a link that might be useful: Metro-North Harlem Line