The Administrator Overview report shows User Activity by users, object, action, and date. It's in the Administrative Detail section of the report. At the bottom of the table, click User Activity and use the drop-downs to filter as preferred. For example, here is information about the actions that sasdemo has taken on Data Queries.
This free video explains how to autoload the audit data that populates this prebuilt report. Although the video was created in 7.2, the same instructions apply to 7.3 and 7.4.