Solstice Canyon in Malibu has a number of easy trails that lead up to a waterfall and some old ruins. Here is a view of the canyon on a foggy spring day:
An old grotto near the waterfall:
Ruins of a house that used to look over the canyon:
Beautiful Coastal Live Oaks line the year-round creek:
All the wildflowers in bloom now seem to be yellow, white, blue, or purple.
The Solstice Canyon trailhead is right off the Pacific Coast Highway and is very easy to find. Parking is free and there are bathrooms and maps at the parking lot. A few of the trails, including one that goes to the ruins and waterfall, are paved and are fully accessible for strollers and wheelchairs.
View Solstice Canyon in a larger map