In many cases, you already have them with your Swiss Travel Pass. 😉
Those leisure packages are intended for people WITHOUT a STP, such as us unfortunate residents.
E.g. for the Chillon Castle excursion, both railway/bus and the castle (museum) admission are already fully included in your STP, the STP is your ticket/voucher.
E.g. for Mt. Titlis, the railway to Engelberg would be included as well, but you would typically buy the not included discounted cableway ticket at the cableway station while presenting your STP.
Therefore use those ‘leisure offers’ just as an inspiration for day activities with your STP.
For details what is already included in your STP and what not, rather stick to the information provided with your STP, such as the museum pass and the => area of validity map (making sure to select Swiss Travel Pass as travelcard in that upper left corner box within the map).
