People tend to check in during these times:
America runs on Dunkin', and DD Foursquare runs on You.
Every one seems in a rush but just mess things up. It's coffee and donuts - not that difficult!!
Watch out for those stairs, I trip in them every time!!
Check the bottom of your receipt for an online survey and receive a code for free donuts when you buy a medium or larger beverage.
Check the bottom of your receipt for buy 1 scoop get 1 scoop free ice cream after 11am. Can also use your DD card for Baskin Robbins
Get a DD card and receive coupons for free medium sized drinks and for auto-recharge on the card.
Pick up some "Spring Shower" donuts/munchkins covered in rainbow nonpareils. Limited time only, I reckon.