Bathhouses for sure! They were a place of not only cleaning but also socializing in ancient Rome!!! I think he definitely did love to go there a lot in his youth (hanging around pretty and naked Men is a plus ofc)

In modern times, there is this old arena that has been repurposed to be a sort of Park, it's in circo massimo, aka the place games where usually held in ancient times and it's so huge and neat!!!