1. Gary Giacomini Open Space Preserve

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    San Geronimo, CA

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    Gary Giacomini Open Space Preserve

    4.0 (1 review)

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    3 years ago

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    Coastal View Trail

    Coastal View Trail

    5.0(2 reviews)
    8.4 mi

    The person who reviewed this 11 years ago was spot on about the beauty of this trail. He biked it,…read morewhich was definitely a lot of climbing and I hiked it today. I'm surprised no one else has reviewed this beautiful trail. We chose this hike because it was so hot today inland-it turns out it was a good decision. The hike begins with climbing almost all the way to the of trail. However, there are sweeping views of the coast, Mount Tamalpais, and beyond. The most fascinating part was the abundance of sedimentary rock we were surrounded by- truly astounding. I had to look up the history of these rocks and learned this- we were looking at one of California's most famous geological features: radiolarian ribbon chert. The strata with the various colors was clearly visible & striking. Additionally we were impressed with the large concrete bunker complex (at the top of climb) Battery Townsley. It's the massive WWII gun battery perched above Fort Cronkhite and Rodeo Beach. I highly recommend this hike for those that enjoy spectacular, coastal views, history, and geology.

    After you ride the Coastal View trail, you will want to sell your earthly goods and then donate the…read moreproceeds to the GGNRA and then devote yourself to mountain biking full time. Really, join me! We'll make it work! We'll live on thistles and spring water, and we'll dance with the butterflies! Oh, never mind, we need beer money...but do check out this trail...I pretty much guarantee you'll love it. Here's my loop: West Blithedale trailhead, up Old Railroad Grade to West Point Inn, past the Inn to Old Stage Road trail, down to Pantoll campground, (through the parking lots) to Coastal View trail, ride Coastal View all the way to Highway 1. Then turn left, ride carefully on Hwy 1 to the Pelican Inn, and have your friend guard the bikes while you get a pot of tea to drink out on the lawn. Then lug your tired rear up Diaz Ridge trail back to Mill Valley and don't hate on me for getting you to a place that's downhill from where you want to be. Alternate plan: Get your friend's husband, who has a truck, to pick you up. Say yes to hitchhikers 'cause that might be you one day and you think you know them maybe a little. But I guess I should review the trail itself: Coastal View is absolutely magnificent. The word 'magnificent' is not an exaggeration, which I am prone to, but not in this case. Single track (but not the scary next-to-a-cliff-you-might-die type of single track) that progresses from wooded bits near Pantoll, to an exposed path, to a Disney-couldn't-design-a-trail-that-looks-this-good segment that winds through some low trees (duck! you might get wet if it's misty), then out to views of the coast (or the fog, depending on your luck). Go with a friend so you can keep saying, "Oh my gosh! This is great! And there's no one on the trail!"* Tons of wildflowers in the spring and great photo ops if you're into that--I am always so blissed out that I forget about photos. Bonus photo op at Muir Beach overlook right off of Highway 1. *OK, you may see a few others on Coastal View trail. On my most recent ride, we saw a single runner (that's it!) from Pantoll to Hwy 1. That said, don't rush it, savor it. Look out for bunnies. PS Yes, you could hike this, too, but I never have. I'm sure it's just as nice on foot. PPS the only place you might lose your way is just past Pantoll, but watch for the signs and I think it is clear.

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    Coastal View Trail
    Coastal View Trail - Check out how cool this is

    Check out how cool this is

    Coastal View Trail - Snapdragons abound

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    Snapdragons abound

    Big Rock Trailhead - Big Rock Trail

    Big Rock Trailhead

    4.5(2 reviews)
    3.1 mi

    What's kinda funny about this trail is how it starts on Lucas Valley Road. There's no parking lot…read more(no restrooms either), so you just park on the shoulder near a big rock. As it turns out, that big rock is the Big Rock, so the hiking-averse among us will likely take a pic and drive away. Talk about premature climax. But you should keep going as the uphill climb wasn't that strenuous, mostly a gradual incline, and it affords nice views along the way. One view you'll have is of Skywalker Ranch, George Lucas's production facility although from a distance, it looked more like an upscale private resort. You might presume Lucas Valley was named after George, especially since he donated the land that led to the formation of the back-and-forth trail. However, it's named after a 19th-century Irish immigrant unrelated to George. The meandering, gravelly trail was mostly exposed so bring water and a hat. If you make it to the radio towers, you can pat yourself on the back for reaching the second highest summit in Marin next to Mt. Tam. You also might be lonely up there as I ran into exactly one bicyclist and two hikers on my entire journey. Instead, put in your AirPods and play a song like Peter Gabriel's "Big Time". Just replace 'Time' with 'Rock'. The lyrics still work: "I'm on my way, I'm making it / I've got to make it show, yeah... Big, Big, Big, Big, Big, Big, Big, Big ROCK!" RELATED - Up for a hike? Here's a collection of trails I've walked and reviewed: https://bit.ly/2OrC8nU

    This is the perfect hike. I started at 4 p.m. on an August afternoon, and finished with plenty of…read moretime to spare. The grade is perfect for some uphill cardio, without going overboard. The downhill is not slippery and dangerous. at the top, adjacent to the radio tower oh, there's even a porta potty. The view from the top is fantastic. Look toward San Pablo Bay. You'll see the Carquinez Bridge off in the distance toward the northwest. look toward the Southwest and you'll see the finger fog pushing through the San Francisco Bay toward the Richmond and Albany Hills. There's a small place for parking right off of Lucas Valley Road.

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    Big Rock Trailhead - Big Rock Trail

    Big Rock Trail

    Big Rock Trailhead - Beginning of the trail near Lucas Valley Road

    Beginning of the trail near Lucas Valley Road

    Big Rock Trailhead - Big Rock Trail

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    Big Rock Trail

    Gary Giacomini Open Space Preserve - hiking - Updated October 2026

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