We booked Grey Line Tours via the internet before we left for New York. We booked the all loops package, which consisted of four separate tours: uptown, downtown, Brooklyn and a night tour. This was good value for money at $49 per person. Even if you only want to take a couple of the tours, this still works out cheaper than buying them individually.
You have to take all tours within 48 hours, which sounds daunting, but we did the uptown in the morning of day one and the downtown in the afternoon. Then the following day we did Brooklyn and then the night tour, so it worked out great. Each tour takes about 2 hours if you stay on from start to finish.
They all start and end in the Times Square area, except Brooklyn, and are on open-top double-decker buses. The Brooklyn tour is on an enclosed coach, as open-top buses are apparently not allowed in Brooklyn, and this tour starts in Battery Park near the Financial District.
You can hop on and off at the numerous stops along the way, but I wouldn’t recommend it. We had to leave quite a few people at stops who wanted to get on, but there simply wasn’t room, or they had to sit in the lower, enclosed deck. I think the best way is to take each fully, then go back to any places that you want to visit again in your own time. The night tour incidentally is not a hop on/off.
If you do these tours when it is hot, as we did in September (85 degrees), remember to take a hat, sunglasses, sunscreen and plenty of water. On the top deck of the bus, there is no protection from the sun and it can become very overpowering. Likewise, if you visit when showers are likely, then bring something to cover yourself. On the brochures it says that rain ponchos are given out free on buses, but when some people asked for them on the night tour, when it got cooler, they only had a couple available on the bus.
As I said, it was very hot when we did the tours, but the night tour can still get cool, as we found out. As we hadn’t gone back to our hotel that day, we were just in t-shirts and shorts, but would have welcomed a jumper as the night set in. So if you plan to do this tour in the summer, pop a light jumper or similar in your bag, just in case.
It also goes without saying that you should take your camera with you. The bus does slow down, or stop at major points, so you can get some great pictures. A video camera is also good, as you can get the atmosphere and the commentary too.
I cannot recommend these tours enough. Great tours, great sights, great value.