Enjoyed everything about NYC, buying voucher ahead was a good choice.
This pass was a great deal and really helped us plan out our trip well. We bought the 3 event pass and managed to squeeze everything in to the 2 days we were here, but it was a lot of intense running around. If you'd like a more laid back trip, you might want to plan for one event a day. We did the Statue of Liberty/Ellis Island ferry the first day, which, as the other reviews suggest, is pretty confusing with this pass but totally worth it in the end. Because instructions on how to get tickets with the EP are impossible to find, I'll lay out the details regarding what you should do if you plan for this here so you don't get lost like we did: when you pick up your Explorer Pass from one of the locations (do this as early as possible so you can get your event booklet and decide ahead of time what you want to do), tell them you'd like to do the Statue/Ellis ferry ride and they will give you ticket vouchers. Once you have those vouchers, take them to Battery Park. At the edge of the park, near the bus stations at the base of the tall black building on State Street there will be a few people in red jackets. Take your vouchers to these people and they will give you your tickets (if this is confusing, just ask one of the security guards near the boats. Tell them about your pass and vouchers and they should be able to direct you). Once you have your tickets, hop in the security line and you'll be good to go! Dress warm, the top of the ferry offers great views but it's chilly up there!
On our second day we did the TV/Movie bus tour and the Top of the Rock. We needed to get tickets for the TV/Movie tour ahead of time, so we picked those up after our ferry ride on the first day. It's a ways away, so plan ahead. Call the office if you are confused. For the Rock just show up with your EP and they send you right up, you can skip the line! Both events were wonderful--the Rock had breathtaking views and the movie tour is great for both TV and film enthusiasts!
We took the guided tour of the 9/11 memorial. The tour guide was a survivor of the 9/11 tragedy and provided us with some very touching personal stories. We ran out of time and wanted to head back and look at everything in this organizations museum. I would suggest allotting 2-3 hours for this tour.