This post will be continually updated with more countries. Click on the link for country/region to get more details. The numbers below are for a family of 3 and exclude shopping which will vary based on the item(s) purchased.

Country/Region Need Cash? How much? (in USD)
China (Mainland) No Zero
Hong Kong No Zero
Japan Yes upcoming post
Malaysia Yes $5/day or $20/week
South Korea Yes $25/week
Thailand Yes upcoming post
Vietnam Yes $20 to $40/day

The table above also excludes hotel tips. Why? Tips are discretionary, and the APAC hotels I write about include service charge. I personally carry my own bags to my room and I don't usually leave money for the housekeeper unless I have spare change as I expect service charge to cover housekeeping.

Here is a table of hotels in Asia that include Service Charge.

Country/Region Service Charge
Bhutan 10%
China (Mainland) 10-15%
Hong Kong 10%
India 5-10%
Indonesia (Bali) 10%
Japan 10%
Malaysia 8%
Maldives 10%
Philippines 10%
Singapore 10%
South Korea 10%
Thailand 10%
Vietnam 5%