and to answer the OP question...most people i see wear no-show socks. as long as you dont wear socks with sandals, you should be fine
and willmingtonwave, i assume snow isnt an issue in NC but here in the upper Midwest i HATE hearing girls b*tch and moan about how cold their feet are when they're wearing flip flops during a blizzard. put some shoes on and shut up if you're cold.