I would walk around in Duluth at any time of the day or night (provided is not too cold) as allways different places have different conditions and as my colleages stated it is necessary to request reports from the Gwinnett County Police Department.
Duluth is a great place to live.... if you like Duluth! How can you find information on a city you aren't familiar with? Try this link for Duluth - you might just be able to see if you and Duluth are suited for one another!
Not everyone lives in Sugarloaf Country Club which has its own set of problems.... Every city has some "special" areas but by and large, most of Duluth is beautiful with low crime. Mostly petty crimes. Luckily, there are a 1000 resources when it comes to crime on the internet.
Here is a way to check thanks to Trulia. Click on the Real Estate Guides Tab, then search for Duluth, GA, then look at bottom of the page for the Duluth Community Information and you will see a tab for Crime Statistics.
In general the crime rate in Duluth is low, but that is one that as a Realtor, is difficult to answer because of Fair Housing Laws. I would suggest that you contact local law enforcement or check the interent for crime statistics in Gwinnett County.
There is a very low crime rate in Sugarloaf. As a guard-gated community, we have a staff of patrol officers that also roam the neighborhood. An occasional prank by a teenager tends to be the highlight of crime.