5 to 15% is the accepted rate of tipping for restaurant servers. If there is no waiter in a restaurant or bar, a tip is not encouraged. Tip amounts vary as many establishments do not use credit cards, so costs are often rounded to the nearest whole number. Tips should not be too small, but they should not be too large, either. You can tip drivers or tour guides up to $10 per day, and housekeeping staff the equivalent of $1 to $2 in Rubles, usually left in an ashtray daily.