If you enjoy the sound of running water, the Indian Creek Trail and Wildwood Canyon Trail at Wildwood Park in Thousand Oaks are for you.
The Indian Creek trail can be accessed from the main Wildwood Canyon trailhead area parking lot at the east end of Avenida de los Arboles as well as at a separate trailhead on Arboles, slightly west of the parking lot.
There are shady sections hidden among the trees and sections in the sun. Most of the trail runs along a creek that flows into Paradise Falls. This is not a completely easy hike as there are some hilly sections, a number of steps, and a stream crossing. That said, there's enough variety to make this a fun and interesting hike with the kids.
Visit the Conejo Open Space Foundation website at www.cosf.org/website/html/moonridge-waterfall-creek.html for a handy map of these trails.
About half a mile or so into the hike, you'll come across a fairly significant waterfall down below, way below, in the creek. Not as large as Paradise Falls, but definitely prominent. Adjacent to that area is a bench. And from there you have some steps and a stream crossing to make it down to the flatter section of the trail.
Eventually you get to a bridge. If instead of crossing the bridge, you veer left (southwest), you'll be on the Wildwood Canyon Trail along the creek. This is a wide path that can take you on another little sidetrack loop up the Castillo Trail to Castillo Circle (street). A bit of a steep, roughly 3/8ths of a mile trail to Castillo Circle, where you can walk back to a separate trailhead via Velarde Drive north to San Miguel Circle to the San Miguel Trail. You'll end up back at the bridge area.
Or, veer right (west) over the bridge, continuing on perhaps the Wildwood Canyon Trail southeast towards the top end entry into the Paradise Falls area (pretty cool to go this way). You can also sidetrack a bit by crossing the bridge and making a sharp right (north) to the short Indian Cave Trail and check out the Indian Cave.
You can return to the parking area by either backtracking up the Indian Creek Trail or by taking the trail directly across from the bridge (basically go straight) up the steep, moderately winding path to a public access road (there is overflow parking available here) to the main Mesa Trail. From there, go right (east) back to the parking lot.
I could go on but there are so many different options in Wildwood Park that we'll stop here for now. Here are links to some other options: