Meet at 9:15am Saturday on Civic Center BART platform or outside Dublin/Pleasanton BART at 10:20. We'll ride to Lake Del Valle along this route http://goo.gl/maps/qUTWM. It is about 20 miles, mostly paved trails and roads with a mile section of flat gravel at the end. It'll be easy on any bike. I've reserved the Hetch Hetchy group campsite which is right next the water. From there you can swim, hike, lounge under the trees, continue biking on dirt trails, rent a boat or canoe at the marina (1 mile south of the campsite). I'm bringing a raft. http://www.twodaytown.com/ is a concert happening down the lake, lets paddle down to it. We can buy ice, ice cream and wood at the marina store. Bring dinner that can be cooked on a campfire.
On Sunday I'll be returning at about noon following http://goo.gl/maps/An5q6, to be back in SF with time to shower before dinner.
There's loads of space at the campsite. If you want to come later or invite friends it won't be a problem. My permit does not allow alcohol. I won't complain about a light drink but if you get drunk and busted be ready to pay the deposit.