go into the church and see that even though outside the building it is busy, urban, NYC inside the building you might as well just be in Utah. They have a full-size basketball gym.

Also, they just put in ten to twenty original Book of Mormon paintings in the church portion of the building (third floor). Painted by a local member and used to try to entice people to come inside to check out the church. The paintings are quite impressive.

But if you only had a short bit of time in the city, there are probably other cooler things to visit.