That depends! If you’re heading to America, tipping is a big part of the culture and is expected when paying your dinner bill, buying drinks at a bar, and even getting a taxi. However, if you were heading to Japan, tipping would be seen as impolite.
In most parts of Europe, leaving a tip of around 5-10% of the total bill is the standard, although make sure you check the bill first, as a tip may have already been included in the total cost of the bill. It’s generally worth reading up on the tipping culture of the region you are travelling to prior to your trip, or just ask your Trip Manager about the general etiquette (even though they’ll probably tell you anyway).
In terms of tipping Contiki staff and Local Guides, this is entirely up to you! If you think a Trip Manager, Driver or Local Guide has done an awesome job (and they usually do), you might want to tip them for this, but this is at your discretion and no one else’s. Just tip what you think is right.