stuff online.
Hmmm, take a complicated recipe and plan a little shopping trip to get the ingredients and make something nice for yourself.
Call your married friends and ask them out for coffee. I'm married and I still love it when my friends call over etc.
Find a picture with make up that you like and try it out yourself.
Start a scrap book.
Make your own youtube video.
Volunteer.
You'd be amazed at how much time this can take up. Volunteer at your local soup kitchen or homeless shelter or staff a crisis hotline. If you're not so good with people look into volunteering with your local Humane Society or environental conservation group.
(I found the last one one a tips thingie)
Check out the bored.com website. They always have lots of idiotic and funny things to do