Us too! Postcards are a great way for people to remember you again later. Additionally, we bring an iPad to let people sign up for our newsletter.
Our biggest hit has always been a prize wheel. People literally stop just so they can spin it- we put swag items on there (lollipops with stickers, pencils, wristbands, etc). It gives us a great chance to tell them a little about who we are and peak their interest in the series.