I worked at a One Hour photo lab in a mall in the mid 80s. That mall was busy, nearly all the time. There were cycles: build up to Christmas, then a big crash; dead around Spring Break; dead on really nice days in early summer; busy on the bleepin' hot days in July and August, though people came to take advantage of the AC, I think. Back to school shopping was big too.
I also remember "Mall Walkers." People who came to the mall to walk around the perimeter instead of walking outside in the heat, cold, rain, snow, bad neighborhood, poorly maintained sidewalks. There were plaques up saying how far it was from the start point to each main corner.