I'll keep adding more suggestions to this post as I think of them:
Zoo -- Giraffe. Rhino. Tranquilizer gun. Bomb item. Give bomb to rhino. Shoot giraffe, which falls on rhino who accidentally swallows the bomb.
Roadworks -- Workmen. Hole in ground. Traffic cone item. Flashing light item. Unseen monster in hole is hypnotised by flashing light.
Giant spider's nest -- Angry Spider. Spider Egg item. Oil Lamp (that can be used as a stove for cooking the egg, that makes the spider sad?)
In a rowing boat -- Another rower. Shark. Paddle item. Box item.
Mine -- Starts in blackness. Miner (you can see their white eyes). Creeper. Torch item. Pickaxe item. switch on torch. give pickaxe to miner. creeper attacks miner. miner defeats creeper.
On top of the Eiffel Tower -- accordion player. French stick item (for whacking the accordion player).
Blue Peter Garden -- Pond, Goldie the Dog , George the Tortoise (can be flipped on it's back). Ball item. Biscuit item. Throw ball in pond and dog will jump in. Give biscuit to tortoise and the dog will eat the tortoise with the biscuit.
It looks like this: A rectangular pond in a rectangular pit. Urns and pot plants. Model ship in the corner. The dog is a golden retriever. The English will recognise it and find it funny, even if others don't. http://www.virginmedia.com/images/bp_garden.jpg
Hippies -- guy with guitar. guy with flowers. don't know what else.
TV studio -- don't know.
On the moon -- Cosmonauts. Do something with US/soviet flags. Aliens attack. McPixel can leave a butt-print in the sand, or sand angels, or something like that which impresses the aliens.
Forest with bears, picnic basket, and little red riding hood.
Desert with scorpions, and pyramids and Egyptians doing funny dancing.
Snow with penguins and polar bear and somebody fishing through the ice.