When I used to play Morrowind a lot, I had Jac's "Passing the Time" mod. That allowed one to read any of the many readable books that were available, and time would actually pass while I was reading. I miss that a lot.... It was a great way to kill of a few hours of darkness when the only other option was sleeping or waiting.
Well, I'm not much for collecting things in FONV because there is really not so much to collect that is actually different other than unique weapons, and while hunting is okay, that seems really to be just part of the game, rather than an extracurricular activity.
I guess one of my favorite pastimes in FONV is playing "kick can" with empty oil drums, particularly in the long Repconn tunnel that leads from the "basemant" to the launch site. It would be fun if there were more empty barrels outside so I could play from say Goodsprings to Novac....