For the past few years I've been going to Mitchell Canyon in the spring to look for wildflowers. It's a fantastic spot: you get a wonderful variety of woodland and grassland flowers as you hike up along the stream, and as you get higher you start getting scrub species, and at the top along the Eagle Peak trail you get a bunch of odd, semi-alpine species. Fun stuff.
This year I think I was a little earlier than usual. No Mt. Diablo fairy lanterns blooming, no pipestem (and sadly no Orobanche), but so many other wonderful things were out in force. I think the highlight of the day for me was the Mt. Diablo jewelflower, a tiny, scrappy little flower found only on Mt. Diablo. I'd seen it a few years back, but this time I found lots of them. Very cool.
Weather was overcast, occasionally rainy, and real windy. Forecast for Sunday was t-storms (which have not come to pass, damn you wunderground), so I figured clouds were better than getting zapped. Still, some weather made it feel like an adventure.
I might head back in a few weeks to see some of the later stuff. So many things to see there.