Our hotel was the Westin and it was a perfect hotel. We ate there at the Palms Steak House, which wasn't cheap but the food was supurb. If you're a baseball fan, many teams stay at this hotel. We were able to see the New York Mets leave the hotel in the morning.
Coors Field is one of the best places I've been to to see a game.
Quick Tips:
You don't have to rent a car except to get to and from the airport which is a really long drive. Most Denver attractions are an easy walk.
Best Way To Get Around:
Walking is fine. Some public transportation in Denver but not too much. As I said, rent a car only for the drive to and from the airport which I belive is about 25 miles each way.