Best lenses for cruise/ vacation Istanbul, Myconos, Valetta, Pompei & Rome

Pietro Marchesi wrote:

I, my wife and our 12 year old son are going for a 7 day cruise on the Emerald Princess starting in Istanbul (Turkey)-> Mykonos (Greece) -> Valetta (Malta)-> Messina (Sicily) -> Naples (Pompei / Capri) ending in Civitavecchia (Rome).

The plan is also to spend 2-3 days before and after in Istanbul and Rome before returning home to Stockholm.

My wife brings a Sony RX100 III (24-70) and my son a Panasonic LX3 (24-60)
We all like to take pictures and film to document our holidays, but this is primarily a family vacation not a photo trip, perhaps less really is more?

My current plan is: Canon 6D with 24-70/2.8L II and only when needed carry the 70-200/4L IS in one of our two small excursion backpacks.

Question 1 - Add my good old 20D for use with the 70-200/4L IS - Less need to change lenses and I get more reach. 20D is not as good as 6D but ok IQ. 20D has the same pixel-density as with the 6D perhaps i is better to use my 6D and crop if more than 200mm is needed? I think the need for tele longer than 70mm is really small and mostly from the ship leaving and entering ports and some vista points? Details high up inside Aya Sofia and other very large buildings?

Question 2 - Not sure if it is really worth it to buy the new 16-35/4.0L IS? Is it really necessary as the 24-70 II is really excellent especially at 24mm? The IS might be a plus? I se uses for 16mm in- and outside some great historical buildings, Aya Sofia, Colosseum etc. But all these buildings are perhaps more interesting at 24-70mm? At 16mm everything is so small and can become less interesting. I prefer more life and details and as often as possible include people and casually my family in the Photo. Am I right? Will I really regret not buying a 16-35mm zoom?

Question 3 - What not to miss. This is our first cruise and the first time for us in Istanbul and Valetta. Please show us your own photos of the special places you liked most from any of the places we are visiting.

Best Regards
Pietro Marchesi
Taby, Sweden

Since both of your travel mates have 24-70 covered, why not do something different? I would bring an UWA (16-35F4L), and the 70-200. And maybe a prime in the middle.

In fact I am thinking that for a trip to Cambodia and Vietnam I might do just that (70-300L instead though). And leave the 24-105 at home.