I would... uhh... this is hard. Such decisions. Probably sleep. I love to sleep. Yeah sleep...
Sleeping is so relaxing, if one sleeps forever do the need anything particularly. I mean, the mind would be healing, so I suppose you would be permanently relaxing. However you would also have nightmares. But I guess before I go into that permanent sleep I could make a dreem catcher, if those even work. So yeah... sleeping sounds good to me.
I would be using a very good computer surfing the net and playing games every day. Then everything I need to survive is already provided so I would have a good time surviving.