If you're on Manhattan, head towards The Ginger Man, Rattle 'n' Hum, Blind Tiger or The Pony Bar. Brooklyn: Barcade, Spuyten Duyvil (above) or the brewery.
New Yorkers will happily drink pint measures of a beer that's too strong to be drunk in pint measures. If you ask though, most places will sell you a half pour for half price.
Very strong beer will often come in a short measure. 10oz, 8oz, something like that. Ask for one by name and you'll be given the smaller serving automatically.
Always take ID with you. I might be lucky(?) enough to avoid age checks in England, but I was asked 3 or 4 times in NY for ID. Easier just to have it with you at all times.
New Yorkers don't know where the date of birth section is on a UK driving licence.
Look out for the option of a flight on the bar menu. Often a selection of around 5 taster pours of your choosing, it's a good way to try a few beers without getting hammered too quickly.
Drinkers in New York tip very well. The result of this is that barmen will expect you to tip well also. If you're paying by cash, the standard is to leave a dollar per drink on the bar after you've paid for your round. The first time you do this you'll wonder if you've made a mistake, they will eventually pick the notes up though. Honest. If you start a tab or ask to pay by card, there's a handy space on the receipt slip for adding a tip amount.
Practice your signature, chip and pin doesn't appear to have arrived in New York yet.
For some unknown reason, when you pay for a round by cash, you always seem to get dollar notes in the change ...
The plus side to all this tipping business is that the barmen of New York are some of the friendliest, most knowledgeable people you'll ever encounter.
In Opposite Land (also known as the USA), cask is the new keg. Whilst everything I personally tried was great, I was warned over and over that cellarmanship is still some way behind the enthusiasm for cask beer. Take caution.
In Opposite Land, people eat with their feet and walk on their hands.*
Don't fall for the IPA fries at Rattle 'n' Hum. They're just fries. Good fries, granted, but just fries all the same.
If you've ever wished you could buy a shirt or glass emblazoned with the logo of your favourite bar, you're in luck. NYC is merch-crazy.
If you are planning a trip to The Big Apple soon, keep it yourself, I'll just get jealous.
* Note: This might be a lie.