How Much To Tip--And Why: $50. The general rule is that a safari's driver and guide should each be tipped $5 to $10 per day. In this instance, tipping on the low end is acceptable ($25 for the guide, $25 for the driver). Give more if the service is friendly and helpful--especially if guides go out of their way to make sure you see amazing landscapes and wildlife. A lot of vacationers tip guides and drivers $10 or more each per day. It's not much, considering you're spending thousands on airfare and the safari.

Scenario: You're with two friends watching basketball at a New York City bar, and after steadily tipping $1--$2 per drink, the bartender buys you a round.

Download our handy, printable tipping guide to 10 popular countries. If you don't already have it, you will need Adobe Acrobat, a free (and easy!) plug-in, to read the guide Download the Tipping Guide Download Adobe Acrobat FEBRUARY 2006 ISSUE • Table of Contents • Secret Hotels of Costa Rica • Europe on the Quick: A Long Weekend in Stockholm • Pacific Coast Highway • Trip Coach: Spain, Portugal, and the Azores • Shut Up and Ski • 40 Best Vacations

How Much To Tip--And Why: $12. The fabled buyback should be rewarded, generally with an amount about the price of a round of drinks. (Don't expect buybacks in touristy areas.) Different bartenders have different rules for when they give customers freebies--one for every third or fourth round is common. Tip more if the buybacks come more frequently, or if you're given appetizers or shots on the house.

Scenario: A 10-year-old in Marrakech, Morocco, instructs you to follow him around a corner, where there's a nice view of the sunset. He sticks out his hand and says, "Baksheesh."

How Much To Tip--And Why: 25¢. The concept of baksheesh, which can mean a tip, bribe, charity, or all of the above, is ingrained in the culture of the Middle East and North Africa. Token gratuities are expected for acts as minor as opening a door at the airport or pointing out the sunset, even if you never asked for assistance. If the boy was rude or pushy, skip the tip. But the amount is so inconsequential that it's easiest to hand over a few coins and be done with it.

Scenario: In Japan, where tipping is a rarity, you've just checked into a traditional ryokan, and a maid stops by and brings tea and a snack to your room.

How Much To Tip--And Why: $10. Ryokan inns are exceptions in Japanese society, where there's no need to tip most service workers, including waiters, cabbies, and porters. Even though a basic gratuity is included in the bill at most ryokans, it's customary to give $10 or so to your maid at your first interaction. As is the case throughout Japan, it's important to be discreet and follow protocol: Have the money ready in an envelope and give it directly to the maid, as thanks in advance for her assistance.

Scenario: After a few hours at a $10 blackjack table in Las Vegas, you suddenly hit two blackjacks in a row and find yourself up $150.

How Much To Tip--And Why: $20. Casino dealers aren't tipped as consistently as, say, waiters. But it's good karma (which every gambler needs) to tip an occasional chip or two, especially when you're winning. And absolutely tip the waitresses serving free cocktails: $2 per drink at the minimum. There's no need to tip if you've only played two hands at a table, however. And if you're down a few hundred bucks, tipping the dealer doesn't guarantee your fortunes will change.