Like many others I'm looking forward to our return to Denver in just a few days. I noted that there are some useful guides and a nice video at the following URL:
One interesting tourist activity a short distance from the Convention Center is the US Mint:
The United States Mint About Us
For the sports enthusiast one could take in a tour of Coors Field (Coors Field Tours | Rockies.com: ballpark) or the Denver Broncos Sports Authority Stadium (Tour the Stadium) not far from downtown.