Great campground, stayed 4 nights in December. Highlights include sunrise views over the lake and hills with rolling fog, wild turkeys everywhere, smell of eucalyptus, warm showers, and scores of dedicated staff who genuinely care about this place. Sites are also nicely-spaced apart. (Though this also has the drawback that many of them are a significant walk to either the entrance or to bathrooms).

Only bummer was that in winter a lot of the best sites are closed. Also, not that there's a ton they can do about this, but the eucalyptus trees shed a ton of bark and so the roads are littered with them giving the place a kind of constant "just-survived-a-storm" kind of feel (at least when it's windier).

Most no-hookup sites are flat. 47 was the one I settled in since it is closest to the showers / sink for washing dishes and also has a little bit of lake view.

Just know that it's a hilly and winding drive in. Figure ~30 minutes from Castro Valley, the nearest town.

ATT data signal was modest (5-25mbps). T-mobile was basically non-existent.