Kaohsiung's crime rate is much lower than probably any city of comparable size in the West, so tourists need not be too worried. Theft tends to be the most common form of criminal activity encountered by foreigners, and expensive bikes and scooters are frequent targets.
As a major seaport, organized crime has also become an increasing problem in the city, and a fair number of businesses are nothing more than a front for local gangs. That said, the gangs do not resort to random violence or theft.
In general, Kaohsiung offers a very safe environment as long as you mind your own business and don't get involved with local rivalries. Violent crime is very rare, and visitors should not encounter any problems - though, like any major city, it is always wise to err on the side of caution.
Also please remember: tap water is not potable.
