Increasing awareness of being blind, and using team work to overcome a challenge or two.
Split the unit into a few equal sized teams, and ask them to pair up. Blindfold one person in each of the pairs (using neckers) and tie the other partners hands behind their back - just to stop the temptation!
Then draw a circle (large enough for the tent to be pitched in). The blindfolded members are to be inside the circle and pitch the tent, with their partners as their 'eyes' outside the circle.
Working as a team, the first team to pitch their tent correctly wins.