I've been trying to get out on my bike religiously every Saturday morning.  It really helps me to have the ritual, so that I assume I'm going unless something else comes up.  It's almost like I feel drawn to the ride, so instead of having to force myself, I have to force myself NOT to ride.  We usually do about 30 - 40 miles up in Marin county, and it's an amazing way to start my weekend.