Grocery stores are great places to sketch. Lots of subjects, from produce to shoppers. The shopping carts can be used as mobile easels and another plus is that you can get a little shopping done whole you sketch! We met at the Oakland Whole Foods for our monthly public sketch night. Besides having beautiful produce and floral departments the store has their parking lot on the roof so there are great places to sketch the surrounding neighborhood and some interesting views of the store from the top entrance.