We had a problem with our voucher We purchased one senior and two adult tickets. The voucher was just a bar code and when it was scanned at the museum it only showed one ticket. I was lucky that I brought along a copy of my receipt how many tickets I bought and amount paid or I would have not gotten my 3 tickets. I probably would not purchase from Viator again. I also think it would have been cheaper to purchase the tickets at the museum. We had to wait on the long line anyway. However the American Museum of Natural History is amazing as always. The Hayden Planetarium is world class. If you are going to all of the special exhibits one needs a minimum of two days.
Exchanging our vouchers for tickets was a little difficult inside the museum. It was very unorganized.
We enjoyed spending the day at the museum. It is very very large so get a map. We loved the butterfly exhibit. It is amazing to see how far we as humans have come. There is a lot to see you could spends 2 - 4 hours depending on how time you have to spend. The new dinosaur exhibit on the 4th floor is amazing. I would recommend visiting the museum. It is near Central Park which is a plus.