We went on the 90 minute landmarks tour after spending the morning exploring the nearby Intrepid Museum. The boat ride was a lot of fun, and the tour guide made sure to point out all of the landmarks.
The highlight of the tour is a trip over near the Statue of Liberty. The boat goes slow by the statue so there is plenty of time to take pictures and admire lady liberty.
There was plenty of seating on the boat. Most people opted for the upper outdoor portion of the deck, and the upper indoor area (which was air conditioned). The lower level was not crowded at all, and had a snack bar.
There is a standing room only deck at the front of the first level. It was really quiet on the front deck. There were only a few people out there when we were by the Statue of Liberty. It was really nice.