The Teva Women's Mandalyn WEdge Ola Flip Flop is my favorite flip flop.  I can wear this shoe every single day without blisters or discomfort.  I accidentally left a pair in a hotel room once, and immediately bought another pair because I prefer not to be without a pair of these in my life!  I can be a tourist in San Francisco all day long in these shoes.  One caveat:  buy two pair so you can switch them out; so as not to get a stinky foot if you wear it all day long every day.