I got you, Erik. We can drive to GWB and just do a ride to Runcible Spoon and back. Just for you, we can cut out the JC/Edgewater junk miles that you hate.
If you don't pack your bike, try to at least pack your saddle. With the amount of running you do, I'm sure your ass will get sore well before your legs. The familiar saddle might help - I was wishing I did that when I borrowed Armando's bike on my SF visit. Tip: Make Sharpie dots on the saddle rails so you can get it back to where you like it on your bike.