well I would come in 10 days and leave for 10 days. I was working in Singapore and a resident in Singapore. Frequent visitor not abuse. Abuse is staying the whole 60 days then getting an extension for 30 days. Then leave for a day and repeat
yes conservatively long jeans, button dress shirt. if you look classy they will think you have money and leave you alone. Wearing a tank top, shorts etc will get you a problem