Just got back from a four day Denver trip and a Rockies game.
We sat in the upper deck behind home plate. The stadium is large and they don't even sell tickets for the upper deck in right field. The stadium was nice though, quite a few craft beer selections, Rocky Mountain Oysters, and elk bratwursts. Also there are some really good views to be had if you switch your seat locations throughout the game (easily done as there were empty seats everywhere). The fans were the least passionate of any stadium I have been at, and this was a saturday rivalry game against the giants. Lots of Giants fans there.
If you are staying downtown, the 16th street mall is awesome. There are many stores and restaurants on that strip. I like it better than Chicago's magnificent mile - and there is also free public transportation up and down the strip.
There are also at least four micro-breweries within 5 blocks of Coors field, as well as Falling Rock tavern which has over 100 craft beers on tap.
We went hiking in the mountains for a day, which was simply awesome. Great views, and a great feeling of accomplishment. We hiked the twin sisters peak as it was free and easily accessible - about an hour away from denver. We stopped in longmont though on the way back though for a few craft breweries. So much delicious beer everywhere.