Today was the previously mentioned Tour de Cure ride.
I'd managed to raise the requisite $150, just from hitting up people I host services for, which made it nice and easy (thanks again guys!).
The weather forecast was fairly ominous, but the rain stayed away until we got back. The ride itself was fairly leisurely. The highlight was cycling through Palo Alto and checking out the very nice looking houses.
25 kilometres was pretty easy. It took a little over an hour, so I think I'll try the 50 kilometre ride next year.
Some photos from the ride are here.