Being in the bath with candles and chillout George Michael playing, sipping a cocktail. It's one of the most relaxing activities.
Shopping.
Cleaning the place and putting everything away so everywhere is spotless. It really calms the mind once everything is spotless.
Watching a great film like either of the first two Harry Potter films, or LOTR, or the Hobbit films. Then ordering a pizza and sitting on the sofa with a duvet over me and just eating and watching.
Going out to the cinema on my own (that and shopping I WAY prefer to do by myself) while no-one else is around.
Walking around London. Visiting China Town. I love China Town, and I love their bubble teas. I wanted to try out taiyaki. The machine that made them looked cool. Video:
When I was out with my friend the other day, it made it 20x better that he was enjoying walking around with me browsing the shops and being interested in all the different food too.