The Arroyo Conejo Open Space is 302 acres bounded by Wildwood Park and Conejo Canyons on the north, Lynnmere Open Space on the east and the Rancho Conejo residential homes development on the west. If you're looking to hike in this area, park your car at Rancho Conejo Playfield at 950 N. Ventu Park Road in Newbury Park.
The Arroyo Conejo Trail trailhead is on the far right/east section of the parking lot facing the park's restrooms and tennis courts.
The trail veers to the left (if you go down the initial trail to the right, you will see this is not open to the public). After passing the park, you will notice that the canyons below are mighty steep and you will hear the creek down below.
After you get to a gate (see below), the downhill is pretty significant and you may see a mini-waterfall on your way down to the creek, where you will immediately come to a crossing that, the last time I was there, had several wooden pallet crossings.
If you continue on straight, you will come across four more creek crossings. Often you will find large rocks or wood planks to walk across, but sometimes you won't find one, so be prepared for the possibility of wet feet if your plan is to reach the Hill Canyon Water Treatment Plant. If you do get that far, then turn back, you'll have done about 5 miles round trip.
If you're looking to extend the hike into something more strenuous, after the first stream crossing, if you look on your right you'll find a steep trail that gets you to the Lynnmere Trail.
Learn more and see a map on the Conejo Open Space Foundation website at www.cosf.org/website/html/arroyo-conejo-to-hill-cyn.html.