Marc wrote:
<I think land and sea lets us out at seaport on southeast side of Manhattan. I then want to head to Tenament Museum and Katz's deli. Then maybe a stop at carnegie to pick up rye break and a couple of pounds of pastrami to go on way back to ship. >

Ok, I assume the seaport you refer to is the "South Street SeaPort". If so, it is a quick cab ride to the Tenement Museum or a 20+ minute walk thru parts of NY you'd never see otherwise.
That museum is a marvel...but you will have to look at the clock before you take a tour.(which you will want to do!)
Katz's deli is almost around the corner. You'll get there with ease.
Carnegie Deli might be a very different matter. It is located rather far from Katz' AND the traffic will not be a friend to your cab.
You will need to watch your clock closely to make it back onboard in time!
But, should you miss the sailing...we have extra room. Would love to have you. (lol)

Doug