1. Don't eat a bunch of chips and salsa and then decide to bike up a 3800 foot mountain.

2. You can see the Golden Gate Bridge from the top of Mount Diablo.

3. Not having to bike down a mountain when it's only 38 degrees out is wonderful!

Here are links to some pictures from my trek up the mountain yesterday.
The first one is fairly early in the ride.
The second one is just shy of the 3000 foot mark.
The third is nearly at the top. The last few hundred feet are an 18% grade! Notice the leg and arm warmers are pulled back up.
The last is some poppies.

http://tvdyson.home.attbi.com/Mount-Diablo/0001.jpg
http://tvdyson.home.attbi.com/Mount-Diablo/00000.jpg
http://tvdyson.home.attbi.com/Mount-Diablo/0002.jpg

http://tvdyson.home.attbi.com/Mount-Diablo/0000.jpg