Trip advisor did not state that you had to check in at a specific spot, so we just hopped on at our nearest location. We purchased a package deal that included Empire State Building tickets. We never received anything from the bus tour, they just let us hop on and off as we wished. When we got to the Empire State Building, they said we had to have a ticket from the bus tour. The phone number on the Trip Advisor website for the bus does not work, so we were our $150, and there is no way to contact Trip Advisor or the Bus tour to complain or request a refund. Do NOT use Trip Advisor!