Tipping is not part of the culture  in Laos, and you are not required or expected to tip anywhere. If you tried to give more money than the set price after you would just confuse the local. 




Laos people like to dress very conservatively and don't like to see people wearing swim suits in town. You will not get in trouble or scolded however, it is more similar to old people in America who think getting piercings or tattoos are vulgar.

Public displays of affection other than holding hands was also seen as tasteless in Laos, but times are changing and only older people would even look twice if you kissed in the street.  

Touching someone with your feet is considered very rude, as is touching the top of someone's head.