Accessible from 101 freeway. Note that Wendy Drive is the last exit before going down the grade and there are no exits for a few miles until you go all the way down the mountain to Camarillo. Also accessible from Hidden Valley. Take Wedny drive to the end, and take a left onto Potrero Road, will take you all the way to Westlake with breathtaking views of pasture and mountains. Backroad to Camarillo is to take Lynn road until it changes into Potrero, will take you past the former Camarillo State Mental Hospital, which is now California State University at Channel Islands. Note when you are traveling down the mountain the wrecked cars at the bottom, which can be seen if you look when you are taking turns. Be careful at night, many drunk teenagers take the road out of stupidity. Also be careful of mountain bikers, who are entitled to share the road with you.
You can take the TOT busline, but service is every couple of hours. Best bet is a car, as destinations can be far apart (like all suburbia) and often walking/biking could be dangerous as in some parts the sidewalk disappears and streets are not all pedestrian friendly.
Newbury Park offers some beautiful hiking trails. Access is located at the end of Lynn Road. On Reino Road, Two Winds Ranch offers horseback riding, with both regular lessons and day rides on the trails in the mountains.