Perfectly walkable. I have them on when I ride to the pub and walk to and from bike store at uni, no problems. Really comfy riding, too.
Re the sandals... I wouldn't, if you brake with your legs. I wouldn't trust the straps to hold me in tightly. I don't get sandals on a bike in general... if you come off, your feet will surely get shredded to bits?
I've got these: http://wiggle.co.uk/ProductDetail.aspx?Cat=cycle&ProdID=5360032439&N=Specialized%20Sport%20MTB%20Shoes
Perfectly walkable. I have them on when I ride to the pub and walk to and from bike store at uni, no problems. Really comfy riding, too.
Re the sandals... I wouldn't, if you brake with your legs. I wouldn't trust the straps to hold me in tightly. I don't get sandals on a bike in general... if you come off, your feet will surely get shredded to bits?