From the Utah section of the new Wikitravel
"Mormons or members of The Church of Jesus Christ of Latter day Saints make up a good part of Utah's population. The beliefs and practices of these people are one of the stronger influences for public policy. Drinking and smoking isn't permitted by their church, and the drinking laws are well-known for being strict and somewhat archaic. Sunday is considered a day of rest, and so most stores will be closed on Sunday. These stereotypes hold more weight in smaller cities and towns, and in some areas (especially Park City and Salt Lake City) the number of non-Mormons do outnumber members of the LDS faith. The people are generally friendly, but may be taken aback by cussing, smoking or drinking in their presence."