Is the wrapper of your chocolate bar worth over $100? It will be if you throw it on the ground. Many cities in the UK now have Wardens (read pseudo-Police) that walk around town centres looking for people littering. They then fine you ON THE SPOT. There are rubbish bins and it’s just not worth it.
Doncaster has murderers, rapists, chavs, drugs, etc like any town. Never venture out of town centre at night into rough areas like the Beckett Road area, Hyde Park, Balby, Hexthorpe and Bentley.
Also stay off North Bridge nr the bus station at night. Your just asking to be attacked because there isn't any lighting in the middle.
Doncaster also has a big prostitution problem as well in areas such as Wheatley down Christchurch Road and down Thorne Road where the hotels are. It is best to walk around at night if you are going to a hotel in a group or with someone, or better - in a taxi.
Also be very careful with Doncaster minicabs. If your a woman never board one alone. There have been loads of cases of rape involving minicab drivers.