While I sleep David and Flora watch cartoons, play and Skype with David's parents. I get up around 8:30, yes that's sleeping in at my house, drink some coffee and go to yoga. By the time I get home from yoga it's lunchtime, which is followed by nap time. That means every Saturday I'm essentially off mommy duty until 1:30 when Flora wakes from her nap. It's the only significant chunk of time I get when I don't have to feed or entertain her and it's amazing.
If you live in Portland you should check your The People's Yoga. It's where I go and they have a great business model. If you don't live in Portland you should see if your city has something similar. I know New York does...
What do you look forward to every week?