Generally if you have noise, you want a water feature to cancel the noise out with "white noise." You might also consider sound proofing your windows.
high fencemad dog
nosy neighbors security Kids Dog pool
fence, dog, camera, trees, trespassing sign, bushes, sprinkler
pigs
fence dog camera tree bush trespass sign
It's most likely for decoration.
The treadmill itself isn't particularly noisy, but running on it will likely be able to be heard through the floor. If your downstairs neighbors have sensitive ears, it might be possible to find some foam padding to put under the treadmill to dampen the sound.
Complain to the landlord.
Where I grew up, you might get your yard rolled with toilet paper or eggs thrown at the house. One year as a trick, some neighbor boys put people's lawn furniture on top of their roofs.
food i guess if you put it in your yard it might keep other Raccoons away
You put pink flamingoes in your yard because they scare away birds that might eat the seeds in your garden or they scare away birds from eating the grass seeds that you might've just planted.
You can put a pool in any yard it doesn't matter.