Hey Angela, we're going casual and simple too, and I am planning to go barefoot. And to my taste, I simply don't like barefoot sandals. In my case I'm thinking to go with a tea length dress, so my feet are gonna be exposed. I consider "flowerish" flip flops - flat or wedges. Firstly to walk at the resort and secondly in case the sand gets too hot. Just some pics for the inspiration:
Or even goofy radical variant:
Or, if the "fluff" doesn't fit with the dress style, it can be something sleek and elegant:
I think no shoes in sand will look just fine. It would be way more awkward in the high heels, huh? Get to try on a wedding dress without any shoes. You'll get the sense of look.