Pretty much all the Fort Collins breweries are a hit, pateros creek, Odell's and Fort Collins brewery are my favorite. I would second stopping in Longmont for Left hand and oskar blues. As many breweries that are in Fort Collins i think now there are about 2-3 times that in Denver now. If you have time in Denver strange/renegade/ great divide are great, if feel like driving about 20min to the burbs's lone tree brewing company is great. Although boulder breweries make some good beer i would stay in foco, Longmont, Denver, and even Colorado springs
If just want to hit some liquor stores Wilbur's in Fort Collins is great and my favorite for beer in the front range, Longmont is close to Daveco's (supposedly the largest store either in the state or country)