Good question ... see what you done? ac98 is going to be Long Air again! 

1. Use a tripod wisely : When you really have to leave your camera mounted and unattended for a period of time, say 10 seconds for a Portrait/Group photo, be sure that it's within your reach and of course running distance should someone decides to have a good dash for your precious investment. My relative lost her camera in Shanghai in a busy tourist spot and another friend of mine her BF lost a Valentine's Day present which is a digicam in France, when you think the LEAST those Mat Salleh won't gasak your things!