Take a couple of hours and go to a movie you really want to see, the one you know your significant other won't want to check out.
When I have the time I love to spend an afternoon with myself, visiting a book store, having lunch, and checking out a new movie.
If you don't want to leave the house no problem, make yourself some lunch, pop in your favorite DVD, and sit back and relax for a couple of hours.
I'm showing my age, but here are a few of my favorites :)
Think of how nice it will be to just get lost in the visuals and the dialogue of a really good movie during the afternoon.
How do you like to spend time with yourself?