When I saw this puzzle, I was thinking sheeez... this is going to be a long 170 puzzles. I got distracted by the animals, started thinking along the lines of which animals belong to the tourists.
I mean, the dog is across the water! It must be a different day.
There's a guy with glasses. He must be the odd one out, right? He can't be friends with the others.
When I got it (after reading a couple of hints), I was realising that there is a knack to these puzzles. I think you start to realise what to look for, and learn to think laterally.
There is one common detail in three of the photos that shows that they were sightseeing at the same time.
Compare the photos until you see what this detail is.
If you're thinking the dog in the photo is the key, you're barking up the wrong tourist attraction.
Is there another detail that links three of the photos?
Look around the feet of each person. Do you see anything there?
The shadows in the photos will give you an idea of when each photo was taken.
Since three people were travelling together, look for matching shadows.
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