Re-entry to China with multiple entry F visa

Is Hong Kong and Macau the only places I can go to from mainland China to re-enter to renew my 60 days duration, or if I go to Viet Nam and cross the border to do some shopping and return same day. Will my re-entry back to mainland China renew my 60 days duration? If going to Taiwan and returning to mainland china, will that renew my 60 days duration?