Have a route set up for blindfolded people to be lead around in an exercise of faith and trust. Have some 'dangerous' parts to the course, like puddles or bushes, that will make the blindfolded person hesitant to run near such things quickly without being able to see for themselves. The faster the course is completed, especially if attempted again, shows growing faith in their guide.
Maybe then try the course blindfolded without a guide - see how much slower it is when you try and do things on your own without following your guide...
