I have travelled to Asia the last couple of years. There, tipping was quite easy for me.
As tipping in the US, where I'm heading to this summer, is more 'complicated', I have some questions. Especially on tipping hotel staff (not restaurants or maids).
When you tip for instance the concierge, do you do that discretely (in the handshake or folded with your documents/passport) or just by hand for 'everyone' to see?
Also, when you ask the concierge to do something (confirm transport), do you tip right away to ensure good fulfilment of afterwards?