If you get a chance to dive without your son, definately see if you can get one of the ops to take you through the elevator at Shark's Cove. I say without your son, because it's considered an advanced dive, surge can be strong and it's an overhead environment for a ways. It's basically a large hole around 8 to 10 ft in diameter in the lava formation of the beach. You'd actually enter the dive through this hole, then follow one of the 3 tunnels(tubes) out to the sea. One of the tunnels has an underground room that you can surface in with room for 3 or 4 divers. We had planned to do it when we dove there in May. One of the guys with me entered it and reported unfavorable conditions though, so the rest of my group entered Shark's Cove elsewhere. Probably your best bet for this dive would be through Deep Ecology, as I'm pretty sure they do it when conditions allow. If you go to Oahu expecting 100+ vis and lush reefs, you'll be disappointed. But if you like wrecks and lava tubes in moderate visibilty you'll be pleased. The place is crawling with both.