DO embrace technology: It can show you what you need BEFORE you set your feet on the ground. Google Earth/Street view can give you a sense of the macro-features, but remember that these online technologies can be six to 12 months out of date.
DO get a solid read on pedestrian traffic counts: Retailers thrive on quantity and quality of traffic. Technology exists to place traffic counters (passive devices) on properties to get not only the body count but also to identify the busiest hours, busiest days of the week and more.