If you haven't heard of the world's longest yard sale then you need to check out 127 Corridor Yard Sale. The 127 Corridor Yard Sale is 675 miles long and is always on the 1st Thursday of August and runs through the following Sunday. This years dates are August 4-8, 2011.
The 127 Corridor Yard Sale covers parts of Tennessee, Alabama & Michigan. Jump in anywhere but be careful, some areas are super concentrated with shoppers, it's kinda dangerous for both the drivers and the pedestrians in some of the areas. Many of the towns along 127 have citywide garage sales, festivals and celebrations during these dates to take advantage of the many bargain hunters.
One of the items on my bucket list is to go to this event and complete the whole 675 miles. I think it just might be impossible to complete this in four days but I'd have a blast trying!
If you know what area you are going to be in, do a little research before you go, you might find more fun than expected along the way!