In the age of dinosaurs, I was a travel consultant. Evaluating shore excursions were part of the deal, along with the rest of the cruise experience, because I only paid port taxes.
I wouldn't recommend taking on evaluations on a cruise ship, unless the MSC is footing the majority of the bill. Evaluating the shore excursions was the worst. Couldn't enjoy the excursions, because I was too busy taking notes and worrying if I had enough film for the camera/ It was never worth the reimbursement back in the stone ages.
Now, if I have the opportunity to take a cruise. I plan on it being on my dime, so I can enjoy all the aspects I love about cruises.
Live your life in such a way that when your feet hit the floor in the morning; the devil shudders...And yells OH #%*+! SHE'S AWAKE!