What's the official footwear of summer? Flip flops! I keep two pairs right by my door -- one set stars Wonder Woman, the other features giraffes in sunglasses. I also bought a fancier, more supportive pair for my recent birthday cruise. My friend Tiffani has practically a pair for every day of summer. Flip flops are her signature summer look. If you love them as much as we do, you'll surely love these activities!