scrapbook stores always do well near Walmarts. WM sells SOME scrapbook stuff but not much and not brand names and scrapbooking is totally a WM demographic. A Dollar Tree would be another good one.
I wouldn`t put a kid-land where people dropped off their kids. Usually, when I`m in WM, I hear WAAAAY to many screaming mothers and out-of-control kids - more so than any other store. I think the WM demographic of kids and parents would make you INSANE.
Starbucks? All the WM`s around here have Payless Shoes, Starbucks, Panda Express or a chiropractic place by it.