In Reply to: all of the above posted by sirion on Sunday, 28. February 2010 at 20:31 Bali Time:
a small lockable, either key lock or combination lock, cash box with you and put your money, passport and valuables in this, then place cash box in the safe / saftey deposit box.
Ok, they may just take the whole cash box, but it makes life more difficult for them. :)