Ladies, please ensure your toes are looking pretty if you are wearing open toed footwear. Nobody wants to see your nasty long toe nails and/or your polish that has half grown off and chipped away because you didn't touch them since last month. As long as they are trimmed, simply wipe off your polish before heading out in sandals. No polish is better than half polish.
Men, I don't know, maybe the obvious don't wear socks with sandals? Oh, and I personally am against men wearing thong flip flops (the wide band over the top of the foot style is OK), but I guess that's not really advice.
"How did you know she was a man?" - Jay
"Because her hands were the size of Andre the Giant's. And her adam's apple was as big as her balls." - Andy