Mount Diablo was an awesome experience and worth the $10 entry fee. I will say the windy roads on the way up were an experience, maybe more so than the actual hiking haha. We (my girlfriend and I) hiked the Rock City trail which was one of the first trails/parking areas we came across. The rock city trail was a cool trail for someone like me who was not a true "hiker" per say. I had my Gatorade, snacks, and bean boots but lacked a general sense of direction. We saw some awesome rock formations along the way, but decided to turn back early as we were running low on Gatorade as well for fear of getting lost.
We hopped back in the car and drove to the summit which was awesome. The "Eye of Diablo" sits atop the summit. I don't know the exact history other than it's a historically significant light house. The views are amazing from all points/all trails. I definitely recommend this adventure. Make sure you have enough gas, snacks, and drinks to hike. Cheers.
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