According to the Colony Leader Guidebook (Deadlock 1):
Each race entertains themselves in different ways.
Humans have a fond love for ancient science fiction pictographics.
The ChCh-t hold exciting stingboxing matches.
The Uva Mosk are fans of live theatre, and their most popular entertainment genre is the beloved Screech Opera.
The interiors of Maug Culture Centers are basically high-tech playgrounds with networked electronic games. The most popular Maug game is one where you can shoot at each other in a virtual world filled bizarre weapons one picks up while running around very quickly.
The Tarth turn their Culture Centers into "Big Dare Rooms" where they brag to each other about doing various feats of strength. A popular game is crushing boulders on their heads.
Re'Lu Culture Centers are quiet places where Re'ite and Lu'ite alike can relax in serene telepathic meditation.
The Cyth participate in obscure group activities that are best not discussed.
This is why no one builds cultural centers for cyth.
So in short... most humans will be watching movies and reading comics?
I am totally going to ask TimeDilation to create 3D models so we can have a "Deathmatch Arena-Style FPS Maug Mod" now.