Denver Breweries & Pubs

So in 16 days I'll be touching down in Denver to blog about the Democratic Convention. Since the days will be extremely well-produced and wholly without sponteneity, I assume that there will be moments when I might sneak out to sample some of Denver's finest pours. It is, you know, the Napa of Beer. However, I'm pretty ignorant about the scene. Doing a Google search reveals six or seven places that look pretty close to the Pepsi Center. Anyone out there have recommendations? I expect to be without a car, so keep that in mind.
  • Wynkoop Brewing Co, 1634 18th St
  • Breckenridge Brewery, 2220 Blake St
  • Great Divide Brewing Co, 2201 Arapahoe St
  • Flying Dog Brewery,2401 Blake St # 2
  • Sandlot Brewery,2161 Blake St
  • Northstar Restaurant & Brewpub, 3200 Tejon St
I don't know how well to trust the Beer Advocate ratings, but it looks like Great Divide gets the highest scores. (Northstar is off the radar--just 11 reviews.) Of these, I'm most familiar with Gread Divide, which has distribution to Oregon. But I'm also interested if these are actually places you can go. Anyone familiar with Denver? Any place a must?