What screams summer more than flip-flops? My favorites: Cobian Nia's. The arch support makes them comfortable enough to actually walk for miles (which I have) and finishes in metallic gold, metallic silver and black patent make them look a bit more like a sandal than a flop. Which brand do you like?
FYI: Those are not Cobian Nia flip-flops hanging out of that van; I just liked the image (via Henry Sene Yee on Pinterest / It's Time to Get Paid on Tumblr). The Nias have been hard to find online -- here's an image of the Nia Metallic two-pack, but I have never used that website. You can also try beach surf shops.
"Use the good china for breakfast."