Roughly a mile easy hike from Wendy/Potrero gets you to the Satwiwa Native American Indian Culture Center where you can explore some native Chumash items and educational information and chat with rangers. This is a nice little hike to take the kids on. There are restrooms and water at the center, which is open from 9 to 5 on weekends.
Learn more about hiking in Rancho Sierra Vista/Satwiwa at THIS LINK.
You can get easier access to the center by parking in the adjacent National Park Service parking lot via Lynn Road to the access road at Via Goleta in Newbury Park.
Another mile and a half of hiking gets you to a small waterfall, which is fun to check out with the kids but somewhat more strenuous of a hike. Note that in recent years (2012-2015), the waterfall has barely flowed due to low rainfall.
Here is more information about the Boney Mountain Trail, leading up to Hidden Valley Overlook, the waterfall and Danielson Monument.
Trailhead at the corner of Wendy Drive and Potrero Road in Newbury Park. Park on the dirt on the south side of Potrero or on the street on Wendy.