The Grotto, Malibu, CA
This is a fun hike into a dark and spooky grotto, with house size boulders, caves, waterfalls, steep walls, and a real sense of mystery. The hike into the grotto is pleasant. Once in the grotto you can have a blast scrambling around on the boulders of you have a good sense of balance and are careful. There are plenty of cracks and corners to climb around, and if you can get beneath the main slab, you'll get yourself into a beautiful little cave, with a small waterfall and pool.