Tipping is a personal decision and depends on the service provided. If the person has been helpful, feel free to tip them. If they have been less than helpful (or flat out unfriendly), don't feel obligated to tip.
For most most services (including porters and hairdressers), tipping $1 is sufficient. For guided tours, a tip is expected, and should be around $5-$10. Taxi drivers do not expect a tip.
Do note that upscale restaurants may automatically include a tip on the bill.
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