The Grizzly Island Wildlife Area is a huge park that sits in the Suisun Marsh, the largest contiguous estuarine marsh in the entire United States. Visitors to this park get to enjoy all of the natural tidal wetlands and artificially diked marshes that are unique to this area, and they can explore them by hiking the 4.5-mile trail that extends through the park.
The complex system of waterways and marshes make this a popular park for boaters, but the trail through it takes you and Fido through an easy path with minimal incline and secure footing. On this trail, you can explore the natural habitats and see the wildlife that these ecosystems sustain.
The Grizzly Island Wildlife Area Trail lets you and Fido walk at your own pace so you can quietly observe the animals that are abundant in the area. Be aware, though -- there are occasions where you may see river otters and deer, yes, but there are also wild mountain lions and other predatory mammals, as well as rattlesnakes, that may consider Fido as their next potential meal. Dogs must be on leashes less than ten feet long at all times.
Although the trail is short, previous hikers have recommended keeping up with the trail guide since your route can get confusing and you have to cross a creek.
Bring plenty of water for you and Fido, and some protein snacks if you plan to take your time and explore the scenic areas. Rattlesnakes are known to be abundant in the rocks by the creek and bushes around the path, so stay vigilant!
To get to the park, take 1-80 north from San Francisco, south from Sacramento, then take Highway 12 off-ramp east toward Rio Vista. When you see Grizzly Island Road take the turn at the stoplight at Sunset Shopping Center. You will see Hill Slough Wildlife Area on both sides of Grizzly Island Road from Highway 12 to the first one-lane bridge. Continue to the Grizzly Island Complex Headquarters, which is 9.5 miles further on Grizzly Island Road.