Q: "Men, surrounded by nature, are riding mountain bikes." Does this mean that "Multiple people riding their bikes on a nature trail."?
A: yes

Q: "A dog holds a large stick in its mouth in the woods." Does this mean that "The dog is laying on its back."?
A: no

Q: "Workers are wearing hard hats at a construction site while building something with wood." Does this mean that "Some men are working."?
A: yes

Q: "A backpacker and a dog on a snow covered landscape at nightfall." Does this mean that "A backpacker with his dog are in snow at night."?
A:
yes