A few days before the trip, I contacted Viator to get basic information about the bus tour in NYC. It took a day to receive a reply.
And, I saw that it would have cost less to purchase the tickets directly through Big Bus instead of Viator.
During our tour, the lines to get on a bus were over a half an hour long.
The staff did not keep the crowd in the line so it wound up blocking a bike lane- we were yelled at by bikers.
We were so tired of waiting and it was near the end time of the bus tour, so our group agreed to sit on the bottom part of the next bus that came along. Big mistake. There was no air conditioning and the windows did not open!! We nearly passed out from the heat!!
When we got off the bus, dripping in sweat, we asked for a refund. A person took our address. I hope you reply to this comment.