How to Cope with Stress During Busy Times?

I'm really inspired by so many people.  I wonder how they do it.  Some people look after their own children and are either going to school or working outside of the home concurrently.  These people have numerous other committments and responsibilities as well.  Then there are other people that are continually pulled in all directions constantly and have so much on their plate.  And yet when I see these people in operation, I think, "How can do this?  How can they cope with all of the stresses in their busy lives and stay grounded?"

The reason I ask, is that my life is going to be getting very, very busy in the next 4 months with increased responsiblities at work, with building a new home, and with the creation of 3 new projects.

I'm leaving Saturdays as my family biking day and Sundays as my family hiking day as a way to decompress and enjoy life during my busy times.  Does anyone have any other suggestions?