Look next to the Tour description if they have letter next to the walking figures they are usually not part of the free excursions
example of free tours
Not included in Free tours
In the T & C
OLife Choice free shore excursions vary by voyage and exclude Oceania Select, Oceania Exclusive, Executive Collection, Food & Wine Trails, Wellness Discovery Tours by Aquamar, Go Local and Culinary Discovery Tours.
https://www.oceaniacruises.com/legal/promotion-terms/