An exercise in ethnography, conducting a Shop Along gives you the chance to observe your user in their natural environment. It's called a Shop Along because often that means accompanying a user on a purchase experience. It could also mean observing a registration process, meal experience or other user touch-point that is relevant to the problem that you're trying to solve. So find a user, get outside of the building and join them as they experience the problem. Don't forget to take notes but try not to intrude. If you're curious about how they are feeling or what they are thinking ask them an open ended question or encourage them to think out loud as the process unfolds.