We always advise changing your travel money before your trip for the best exchange rate, but don’t worry if you run out of time because there are plenty more options when you get there. Although cards are widely accepted, tipping is commonplace in the US so it’s always a good idea to have some notes on you.
Those wanting to withdraw cash when they get there won’t have a problem finding an ATM with machines dotted in and around the city. Prefer to exchange your sterling after you’ve arrived? Bureaus are often found in malls, at your hotel, or in the airport.