There's several good ways of earning some quick money in a day but you must do some hard work.
Try making money Walking Dogs
If you have people in your neighborhood that have dogs they may pay you to take the dog on a walk.
My sister who lives in New York city made some decent money walking dogs for people.
Post an ad on Craigslist about your dog walking services and if you're not too expensive then the people may hire you to walk their dogs for them or even take care of the dogs.
Try babysitting kids for quick money.
Try posting ads on bulletin boards or on Craigslist about baby sitting services and you may get a chance to babysit some kids while the parents are at work or just need a break from their kids.
Taking care of kids though is a big responsibility though so be aware of that but you can make some decent money just watching other peoples kids.
Try Shoveling Snow For Money.
It's winter right now where I'm at and we have some snow and people are making money shoveling snow.
I paid a kid $30.00 to shovel my driveway and sidewalk to get rid of the snow and it was well worth the $30.00 I paid him to shovel the snow.
But that job will only work if you have snow to shovel.
Try Taking Online Surveys for some Quick Money.
Look online for survey websites that pay you to take surveys and read emails or even browse websites you can earn some good money doing that in your spare time.
Offer Yard Cleanup Services.
Another job you can do to make some quick money is to offer to clean up peoples yards and do landscaping if you're good at it.
Landscapers make some good money although it's pretty hard work.