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If you're staying at Casa Del Mar, there's decent shore diving right there. I frequently stay right next door in a small B&B and dive with scuba shack. If you head straight west from their shop, past a few moorings for the cats, you'll find a bit of what used to be the tip of paradise reef, before they dug the channel for the cruise ships. It's about a 10 minute swim.
I don't know who you dive with when you're staying at Casa Del Mar, but I think they have a in-house shop, so you should be able to get tanks there. You might be able to rent them from scuba shack as well.
It's not a bad dive, I've done it dozens of times. It's kind of interesting as a night dive, but there is one caveat. You probably don't want to be out there when the cruise ships depart. I've done that, and ended hunkering down against the rocks while the boat roared past, stirring up the sand.
Edit: I see nodakdive beat me to it!!
If you want to exit in the area in front of Casa del Mar, there is a good underwater landmark. The sightseeing "submarine" ties up to the pier. Its very noticeable underwater.
I do the shore dive in front of Del Mar and Park Royal every year in June when I come down. I usually get Mario at Tikilla to guide me. We usually do close to a 2 hour dive. He knows where to find the Sea Horses, Bat fish, Octopuses. He is also a great photographer. He charges me $28, includes tank and weights. He also has gear for rent if needed.View attachment 447429