our local shops have a play area in areas where the corridors opens up wider so it becomes sort of an "island" in the walk way (shops on either side are sort of recessed back so at that point the corridor is more of a square shape rather than a rectangle). The playground is fenced on 3 sides with netting and has down the soft rubber tiles. there's normally a two level play area with netting to walk over, bumps/rollers to go over/under/between, a slide, things to squeeze past on the top level and underneath is normally a little cubby type place with things hanging down from the "ceiling", blocks to climb over etc. Around the edge on the fence they have things where the kids push marbles around the tracks, naughts and crosses game, funny mirrors (the ones that make your body look squished or stretched etc). Then there's a stand alone mini slide for the little kids and a car or something for the kids to sit in and "drive". Seats are set up at the open side of the fence for parents to sit down while the kids play. Makes a nice spot for the kids to use as a break from shopping and gives me a chance to sit down for a couple of minutes.
In the parent's rooms near me they almost all have the fenced play area for older kids to use - normally just have a play activity thing on the wall, a ikea type plastic table and chairs and a beanbag type thing but it gives me some security for DD while I'm dealing with DS. One that I really love has some feeding "rooms" (the ones with a chair, little table and a curtain for the 'door') set up inside the play area which was really helpful when DS was feeding frequently. There are also feeding rooms outside the play area for those who don't have older kids but I loved that DD could be playing in there and I had a fairly easy view to her so I could still keep an eye on her. A lot of the others just have the feeding rooms separate to the play area so I wasn't comfortable using the little rooms because I couldn't see DD so I'd end up just feeding DS on a seat out in the main room so I could keep an eye on DD.