Get a constant stream of people who answer surveys.
Place these kiosks where a lot of people come through. Make it a game. Some game elements can be:
– Have the surveys done in a delightful and different way each time.
– People who play and give an identification (email or phone number) get to be on a leaderboard of most surveys done, within a period of time, most questions answered etc.
– Allow participants to view on the spot or get the results by email.