While hanging out with the characters, I mean.

General: Probably talk about the events covered in the anime and manga.

Konata: Play video games, watch her play some of her video games (there's a certain genre I'd rather avoid), watch anime, read manga, trade references.

Kagami: Read and discuss light novels... um... not sure what else we'd do...

Tsukasa: Hmm... well, if Konata and Kagami are going to see Saw somenumber or something like it, I'll accompany Tsukasa to something she wants to see. I don't like horror myself, and I expect she'd probably choose something I can enjoy, as well.