Christmas Tree Cove isn't bad, but it's more of a challengling beach dive than a good boat dive. The trail is one of the tougher P.V. ones and the nicest part of the reef is outside the cove. It breaks the surface at low tide. The reef extends down to eighty feet, but there isn't much life below thirty-five due to the silt on the rocks. There are nice overhangs and a mini-wall, but nothing spectacular to offer paying customers.
Whale Rock Pinnacles are like miniature Ship Rocks. Rockfish, sponges, blue-ring topsnails, lobsters, everything you can imagine on a nearshore reef is there.
Hawthorne Reef is a little deeper at eighty feet but every inch is covered by color that would make Walt Disney proud. There's even a swim-through.
The Underwater Arch is big enough to drive a car through and the reef is alive and well, but it's near shore and shallow (35 feet) so it makes a nice final dive of the day. It is located on the outer edge of the Neptune Cove Pinnacles.
Buchanan Reef at Marineland is loaded with everything. It's the only reef I know with more nudibranchs than the Point at Marineland. It extends to eighty feet with high spots here and there. You can also swim in toward shore and dive in just a few feet of water while still enjoying a submerged aquarium. I caught one of my biggest lobsters in ten feet there.
There are also many wrecks on the south side of the hill. The Jenny Lynne at Marineland is a technical dive due to the depth (145') and entanglement issues. The boat is at a 45 degree starboard list and still has it's tower, mast and full rigging. I've dived it three times and never had more than a few feet of visibility. Scary. The cool part was seeing metridiums on the wreck less than a year after it sank about a thousand yards off Cobble Beach.
Wrecks within recreational diving depths include the Olympic II, Ace One, Fog Wreck, African Queen, FS Loop, Gambler, Georgia Strait, Radio Tower and more un-named wrecks along the coast.
The south side of Palos Verdes offers more variety to see than any place in SoCal.