I have always bought tickets and done this on my own. Make sure that you do anything relating to Statue of Liberty and Ellis Island prior to going, and I suggest you go EARLY, like right when they open. The line gets really long. The "hop on/hop off" bus is great. It takes you to so many places, and I find they know a lot of history. I like it also that you can get off if you want and walk, shop, eat and then get back on. There is so much to do/see. Make a list and prioritize your must see's and then go from there. You won't be disappointed. Make sure you take in at least one Broadway play. Either get tickets ahead of time or go and stand in line at the Tickets line to get discounted tickets. However, if you do this, you don't know what is available, but most of the time ALL of the plays will be available - except for Hamilton. I hope you have a memorable trip!