Q: "A group of youngsters swim in lake water" Does this mean that "Youngsters skinnydipping in a lake."?
A: it is not possible to tell

Q: "A man with dreadlocks is riding a skateboard down a street while smiling at the camera." Does this mean that "A man is outside."?
A: yes

Q: "A woman in shorts and a green hoodie, at an observation point along a trail, overlooking the mountains below." Does this mean that "The woman is wearing long pants."?
A: no

Q: "A worker walking down the street." Does this mean that "A construction worker walking down the street."?
A:
it is not possible to tell