I want to add Activities fields or Relationships in Drupal Views. Do I need to add/install CiviCRM Entity?
The answer is No, you do not, at least for Drupal 7. What I was missing was to first, add a new View, selecting CiviCRM Activities, not CiviCRM Contacts. I discovered clues starting on page 169 of The CiviCRM Cookbook by Tony Horrocks.