Definitely agree with taking vacations during semester breaks or summer. But cancel all leisure and wkend activities? How do you stay sane, and have something during the week to look forward to? I think studying is the main reason you're there, but I think people need to have social activities and "rewards" to look forward to!
Well, you can plan perhaps to go out to eat and occasionally see a movie. But other than that, you will spend most of your weekends on your computer doing research in the online university library, reading and/or writing. I have not seen the sunshine on the weekends for a long time. Then again, I do work full time as college faculty during the workweek with the exception of the summer months. This has been my experience since I started my doctorate last July. However, it has been worth it so far.