I concur with everyone here.
Tours are a tourist trap, don't do it, experience the city on your own.
You can walk from the 9/11 Memorial to Wall Street, it's about a 10 minute walk if you're going at a leisurely pace. My mother works on Wall Street and I take visiting friends there first to experience the area and then head down to 9/11 and then to the Seaport, which is a little out of the way, but it's a destination unto itself since ... y'know, boat. I personally haven't been in about two years, but I've heard that it's changed and it's undergoing some massive reno, so, it may not be open right now. You can also walk from Wall Street to the ferry that takes you to the Statue. Everything is in close proximity where you're wanting to go, but the ferries take forever, just a word of warning. And the Statue is kind of an at least 1/2 day thing.
Just a note, if you're wanting to go to the crown of Lady Liberty,
this is what you need to know.
Just some pointers for your trip. Please, please, for all that is holy and mighty in this world, do not block the flow of traffic on the streets, especially in busy places like 42nd Street, we New Yorkers
will curse you out (I live in CT, but I was born and raised in the city), and you'll think we're mean-spirited, but we're not; we have places to go. Just as you hear/see from the media/tv/movies, we're a fast-paced city, and we like it that way, so please don't get offended if something goes awry. Also, let people off the subway before you get on, don't crowd the doors, or you'll get shoved like a rag doll and no one will bat an eye. I'm not being facetious. But have fun, have the time of your life, New York City is a lot of fun and your senses will be exploding (from food carts, to just smelly subways, to OH MY GOODNESS IS THAT REALLY THE STATUE OF LIBERTY!?) and it'll be awesome. Even I'm still amazed at how awesome it is.
Anyway, have fun, do your thing with the beautiful wife and enjoy my town!