I flew this route in April with 3 pax in a 172. If my memory is up to anything, the procedure is sticking to the west side of the Hudson southbound and east side northbound (like cars on US roads). The NY class B starts at 1,100ft over the river and it was recommended to me to stick above 500ft to be clear of most of the helicopters.
I briefed my pax to do all the sight seeing and picture taking, whilst I did the flying and maintained a lookout. I did the tourist bit via the photos back at home.
The biggest issue I had at the time I flew it was the radio; you are supposed to self announce a brief location and altitude passing landmarks on the map on the common frequency (e.g. Cherokee, Intrepid, southbound at 700 feet). On the day that I flew the tourist chopper pilots were also using the frequency for all sorts of innane chatter (e.g. what's the score at the game etc etc) and requesting fuel from base. It made deciphering where traffic was almost impossible due to the constant drawl.
Gareth.