Okey-doke.

Here is the loop I recommended (35 miles) from St. Helena with maillotpois' recommended descent of Howell Mtn. I like this idea because it isn't as fast and furious as Deer Park and it keeps you off the Silverado Trail as much as possible.
http://www.routeslip.com/map.php?map=3251

Here is the 54 mile loop Bubba and I will probably ride this weekend. We may see you out there as much of it overlaps. We can evaluate MP's Howell Mtn recommendation also.
http://www.routeslip.com/map.php?map=3249