You can check if this website offers day tickets for unlimited travel, for Lugano, or for other people, the commune where they live.

http://www.tageskarte-gemeinde.ch/

Usually they are between 20 CHF - 35 CHF per card. It is like a GA for the day, sponsored by your commune, and you do not need a halbtax. Usually however you need to order weeks in advance. You may need to search google if you live in Ticino or the French speaking part, as the site will not be called Tageskarte..., but a translated version...