We have a ship tour booked but we tend to like to do things on our own . I've been reading the other recent post on this forum on how walkable Istanbul is and how to navigate the tram. That said, is it still worthwhile to stick with the ship tour as they most likely have access tickets already in hand? If we opt to do this on our own, are the lines to access these sites so lengthy that it's in our best interest to stay with a ship tour? We are overnight in Istanbul, so that first day timing isn't critical to be back on the ship at a certain time. Our goal for the first day was Hagia Sopha, Blue Mosque, Cistern, Grand Bizarre. Thanks to all.