From and article on the Regent website:

Regent Seven Seas Cruises and Travel + Leisure, the world's leading travel magazine, announce the launch of Insider guides, now available as part of The Regent Travel ConciergeSM aboard sailings in the Mediterranean.

Insider guides are the newest addition to The Regent Travel Concierge, a program created to customize guests' travel experiences based on personal interests and preferences. In partnership with Travel + Leisure, Regent aims to further personalize and enhance this offering to guests with the latest editorial insights about the worldwide destinations visited by the luxury fleet.

Currently offered for 20 European destinations, Insider guides provide Regent guests with recommendations for attractions including lesser-known spots and local favorites in specific ports of call, each hand-selected by Travel + Leisure's team of on-the-ground travel editors and researchers. Available exclusively to Regent guests onboard each ship and online, the guides will highlight activities and attractions for a range of interests