I grew up diving Crystal Cove aka Christmas Tree cove. On my last dive in 2007, I introduced my kids to the site. No doubt the hike is an issue, so travel lite and take your time. I recommend beach entry off the south point. Go south for lobster, West for fish, and there is a GREAT tide surge tube on the south side of the south point about 25-35 meters (about mid-reef) that at high tide is a fun spot for snorkels. Be safe and enjoy.