Isn't playing with niche.tv and CollegeCams as well as watching tv in the lounge perfectly fine for loners? These are pretty strong Relaxation wise. You can also always play games alone.
Yes, you are completely right. I forgot you mentioned both, Relaxation *and* Attention.
More activities are of course always welcome and if you are honest, the main work put into the game atm is to provide more activities. The whole River Rat thingy is full of new activities.
I think we are to see more and more activities as the development of the game progresses.