This is what Princess calls that excursion, I too have done the Rhum Runner a couple of times and will be doing this one in November 2023. It looks to be the same.
Harbor Cruise, Grand Anse & Morne Rouge Beaches
Swim or walk the snow white sands of Morne Rouge Beach. What better way to get there than aboard the Rhum Runner catamaran cruiser? Launch from St. George's inner harbor and zip out across the glistening water. Feel the sea breeze in your hair and the sun on your face as your captain speeds along Grenada's scenic southern coast past Grand Anse Beach. Enjoy rum punch, soft drinks and local fresh fruit as your guide provides commentary on the island's history and culture. A brief stop at Grand Reef allows you to view the colorful marine life and feed the fish. Then, you'll drop anchor at Morne Rouge Beach so you can swim or simply relax on the sun kissed sand. On your way back to St. George's dance to the band's Caribbean beat, participate in the limbo competition or form a conga line with the friendly crew.
Hope this helps!