A few things I've found work well:
- Visible Signs and a few ol' fashion bright balloons and streamers.
- Moving things around and readjusting my merchandise as things are sold.
- Greeting everyone with a smile and hello.
- Putting a price on everything and making sure it's visible.
- Being ready to go early in the day.
- Having enough change. ($1, $5, Quarters, Dimes, Nickles)
- Pulling larger items out so they can be seen from the road and draw people in.