Been going to NYC since the early 90s as my old fella worked for an airline - a wonderful City and though pricier than it was a few years ago, still so many things to see & do
- The 9/11 Memorial is a must. Allow yourselves 3 hours whilst there and prepare to have your heart strings tugged at when you're there. O'Haras - as highlighted by another poster - is the best bar in that area of town and full of 9/11 memorabilia and a tribute to the FDNY.
- Go and see a Mets game at Citi Field. The Mets are at home to the SF Giants next week (Fri 1st Aug to Sun 3rd Aug). Take the 7 Train to Mets/Willets Point (about 20 mins from central Manhattan) - I'd recommend seats anywhere down the 3rd Base side in the upper deck if it's a day game (avoids being in the sun), or in the Upper Deck of the Coca Cola Corner. Don't bother with the Yankees - basically Americas version of Man U and the ballparks full of tourists & glory hunters. You can get decent seats for Mets games for around $35 - $40 either on StubHub or from the Mets direct via the MLB Ballpark App.
- Staten Island Ferry. Still the best free thing in NYC. Takes you right past Lady Liberty
- Have breakfast in a classic Diner. I'd recommend The Astro on 6th Ave at 54th Street. The Homefries (their version of Hash Browns) and the Bagels are to die for. There's tons of great Diners - go explore. Breakfast is always a hive of activity and I've found having Eggs "over and easy" the best.
- Scruffy Duffys is a great Bar. 10th Ave at 45th Street. Decent Guinness when you get tired of gassy American Light Beer, and the Wings are superb
- The Circle Line Boat tour is good when the sun shines. You can pick which route and do an entire trip around Manhattan Island which is a great way to see NYC in the summer.
Metro system is easy to navigate. Download the free App and Tap in/Out as you do in London. Just don't get on it late at night - as you wouldn't in any major City.
Walk and explore. You'll find places yourself and there's so many hidden Gems. Remember 5th Avenue is the dividing line on the Manhattan map - so any street that's East 34th Street for example, means it's towards the East River side of 5th, and any street that's "West 34th Street" is towards the Hudson River side of 5th.
Enjoy - it's the greatest city in the world.