It was supposed to be a warm, sunny day.

We had slathered on the sunscreen and filled the Camelbaks up to capacity. The weather forecast said 68 and sunny throughout Marin.

But as we approached it, the bridge was wreathed in fog. And as we started up Mt. Tam to Pan Toll Ranger Station, the fog got thicker. And thicker. And then it started to drip rain in spurts. And the fog was so thick you could barely see 50 feet up the road.

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