As a tourist, we of course had to ride the horse drawn carriage.
Even before we arrived at the entrance to the Central Park, we were approached by numerous "pimps" who asked if we want to hire bikes or horse carriages. I ignored all of them, thinking that the horse carriages are all enterprising individuals, and why would they need any agent. I would rather talk to the horse carriage drivers directly.
On the carriage, I asked the driver what's the deal with the "pimps". The driver said they are "thieves". At best they mark up the price making some quick bucks, and at worst they took the tourist money and ran away.