A group walking in the middle of a walkway with a green divider, and a woman is walking by herself off to the right.
The group is taking a tour.
a group walking doesn't necessarily mean they are taking a tour
The group may not be taking a tour but walking to a bus stop.
A group walking in the middle of a walkway, and a woman is walking by herself off to the right doesn't imply the group is taking a tour.