What are some of the negative reviews of Snow Falling on Cedars or where could I find this information?
Enotes actually has a couple reviews available right on the site. The links below will take you to the full text. The first mostly complains about the novel's lack of excitement. In short, the critic found the story long and boring.
The second is a mixed review. It says, essentially, that the novel was a good story, but lacked emotion and a lyrical quality that the title implies. Generally, this critic seems to have had higher hopes for a more artistic story, but was satisfied overall despite his disappointment in that area.
Aside from these two short reviews, I encourage you to access your college library's extensive list of literary publications, criticism, and journal articles. Almost every college and university provides (free) access to an online database of literary publications, and usually, if your library does not have the materials you are seeking, they will have reciprocity with another college library that does. I advise you to take your query directly to a librarian on campus, who will then show you how to access and use these databases. Two that I can think of are JSTOR and EBSCOhost. Usually, using your student ID and password through your college library will allow you access to far more than you would be able to find simply using the internet from home.