I also recommend citymapper, though found it more useful in central london than I do in Manhattan. If there's anything in particular you're interested in we might be able to provide more specific advice. We all typically live and work in different parts of the city so we will probably know more about certain parts than others. I used to work in the financial district downtown until about a month ago when my company moved to the west side 2 blocks from the garden
I'm still looking for a good deli.
I'll also add that you need a metro card if you take mass transit as I don't know if any bus still accepts cash. If you take a select bus you need to pay before you board, even if you already paid for a metro card. There are kiosks by the bus stops and you will get a receipt (edit: I think you can use cash at a kiosk). If you have a regular pay-per-ride metro card the bus fare will be debited but if you have an unlimited card or are making a transfer you will get a receipt but you won't need to actually pay anything additional. On occasion MTA officials board the bus to check for receipts so make sure to have it.
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I'll also add that you need a metro card if you take mass transit as I don't know if any bus still accepts cash. If you take a select bus you need to pay before you board, even if you already paid for a metro card. There are kiosks by the bus stops and you will get a receipt (edit: I think you can use cash at a kiosk). If you have a regular pay-per-ride metro card the bus fare will be debited but if you have an unlimited card or are making a transfer you will get a receipt but you won't need to actually pay anything additional. On occasion MTA officials board the bus to check for receipts so make sure to have it.
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