Onboard activities that are bookable are similar across the entire fleet: Adult dining (Palo, Enchante), Alcohol tastings, Spa and select salon treatments, Royal Gathering, BBB/Pirates Makeover, photo package... Pretty much everything else will be revealed in the app once onboard. Some web sites publish "navigators" of previous cruises which can be used as a proxy for those other activities that may be offered. As of now, the only navigator available through those sites and specific to the Treasure is the one for the maiden voyage