We rode the Solvang Century on Saturday and (surprise) proved without a shadow of a doubt that we need longer weekend rides and more climbing. We can ride 100 miles and we can do some tough climbs, but we can't do both on the same day. More precisely, I can't get the tandem up a sustained 11% grade after 85 miles Actually, was a pretty nice ride, but we need more base so we can do 80 miles or so with some climbing very comfortably.
I'd definitely recommend this ride for the scenery alone; it's a beautiful area. The roads are generally good although we hit one stretch at a 35 mph downhill runout that was very rough. Rests stop were just ok, especially considering this is a large ride, but everyone who does these things seems to have different expectation levels.
Next weekend we'll lead a 58 mile "B" ride with a bit of climbing; this will be a nice relaxing recovery ride.