I walk 8+miles a day most days and nothing I own is really standing up to it. I have some lovely leather sandals from Gap that are pretty comfy but starting to fall apart, I suppose because the amount of walking I do.
I don't really want Fit Flops though they are v comfy I just can't put aside how mumsy they are. When it's cooler I wear Superga but in this heat, no way.
I own a pair of quite old Timberlands that are really comfy. Also a pair of Reefs, flip flops, but are amazingly comfy and quite light and cushioned sole. And a pair of patent Birkenstocks in a mad colour. These 3 would be my port of call next time I look for new shoes. I don't do fashion when it comes to my feet, they have to be comfortable, but my feet are very narrow and I look ridiculos if they are bulky or busy.