If you hope to learn something extremely exotic here, you may be disappointed: in terms of savoir vivre, Poland is quite similar to other countries of Europe. When meeting people you can shake hands or just say "Good morning". A man may sometimes kiss a woman's hand during the first contact, but it happens only occasionally and may be seen in public. Hand kissing is also popular among older people who pay more attention to politeness. Many people, especially colleagues and relatives, used to kiss each other’s cheeks when they met. There are two "schools of cheek-kissing" – either two or three kisses, which is sometimes confusing as you do not know when to stop.
As far as giving tips is concerned, there is also nothing unusual. The customary sum of money to leave in restaurants or taxis is around 10%.
When using public transport, there is one important dogma you should know. If any old lady appears in the bus or tram and there are no empty seats, anybody who is younger (it can be either a man or a woman) should give up their seat. The whole thing is quite delicate, as first you have to verify if the woman is "old enough" to rise to.
The older generation, plus rare old-fashioned young men, cultivate many passé traditions and customs. Sometimes you may see someone who helps a woman to get out of the bus by giving her his hand to show courtesy and consideration. There are also exceptional drivers that open the door for their female passenger, whereas the old rule which says that if man walks a woman, she should be on his right hand side has almost totally been forgotten, being kept up only during official meetings or weddings.