in general most buses, metros and minivans have preferential seating, allocated for individuals who need it, so visitors should refrain from using these areas unless they fit the criteria.

cariocas are very proud of their appearance, and concentrate on being put together - playfully clapping or a light bow when someone is absolutely stunning, is a great way to keep the enviroment cheerful and make others feel loved - positive energy is always a plus. 

while dating someone, a simple kiss is also a nice way to show appreciation, and cariocas normally kiss with more ease than americans or europeans.  this can often lead visitors to get the wrong idea if they are not familiar with brazilian public displays of affection.