At Restaurants: A 10 percent tip is included, with locals rounding up the bill and leaving the change. You can do the same or leave 10–15 percent more if you're so inclined.

At Hotels: Per Tour Malaysia, tip the bellboys the standard $1 per bag, and cleaning staff $1 a day. There's no need to tip anyone else unless you really want to.

Guides and Drivers: Private guides and/or drivers should get $5–$10 per person per day.

Dollars Accepted? Yes, but it's easier for locals to trade in ringgits, the local currency (with about 3.7 ringgits to a U.S. dollar).

 

Source : CNTraveler.com