The quickest way to earn cash is to pack your street fair with manned stalls, which are run by classic characters from the Peanuts gang (only five of the game's 18 manned stalls can be purchased for Coins). Manned stalls produce revenue and Experience points at specific intervals.
To collect from your stands faster than ever, simply go to: Settings, General, Date and Time, Change Date and Time, and then increase your IPod's clock by how much time you need. BE CAREFUL! If you decide to do this, you can never change your clock backwards to the normal time ever again if you plan on playing Snoopy's Street Fair anymore. If you accidentally do, it will make ALL of your stands collect after 72 hours! Going back to your last save won't help, either.