1. Always use thin socks unless the bridge of your foot is enclosed (i.e. boots).
2. Have clean, new socks. Don't wear your bally, stained pairs; save them for the gym.
3. Follow the catwalks. Go for colours that are in fashion or textures that are super luxe. It'll help avoid that 'I'm a tourist wearing socks and sandals' look.
Here are five quick ideas for you to try out: