Central Europe · Czech Koruna (CZK)
Rounding up or adding roughly 10% is common in restaurants, stated aloud when paying rather than left on the table.
Common for table service; state the total including tip when paying.
Round up to the nearest convenient amount.
For porters; housekeeping tips are optional.
Rounding up is enough.
Of the tour cost, in cash for a private guide.
Not customary; a thank you suffices.