This is not a question but some advice!
It was great, easy, did not require a visa and was a great way to get outside and get a quick taste of the city!
When you arrive, get off the bus from the plane at the trasfer and departures stop, then go straight ahead after security to a small "tourist" desk, which is effectively under stairs, opposite gate no 5. You can ask there to get on one of their 4 free tours, i think they leave at 8am, 10am, 12pm, and 2pm. The assistant willl help you all the way from there.
It was lovely to see and super easy! you will not be late at all, they are back within 3 hours, easy.