Validated Parking
There is a department store downtown in my city. Parking downtown is a scarce, and expensive, so the dept store offers free parking to customers.
The trick is to park at the dept store, quickly buy a belt or something, do whatever you wanted to do downtown, then at a later date (or later that day even) go back and return the item.
If you frequently/regularly did this, you could return an item and buy a new one in a single trip each time you do this. All while getting free parking downtown for spending a few minutes in the store.
Story credit: Reddit / hydra3a