Makua Beach is on the Leeward Side very close to Ka’ena Point. Parking is only available on the side of the road, but there is a fair amount to be had. We went snorkeling there because we’d heard that people often saw dolphins. Unfortunately, there were a lot of spear fishers when we were there, and they scare all the wildlife away.
The leeward side actually has a lot of spear fishmen. This can be very dangerous, so make sure you keep an eye out for them. They tend to swim with their spears in front of them, and they don’t always look where they are going. I have nearly been impaled, so I’m warning you because I have personal experience with the very real danger.
Another thing to remember is that sometimes there are incidents in Hawaii where a shark bites a human. This is most common for surfers (who look like seals from below) and spear fishers (who have bleeding fish on their belts.) Since sharks can make mistakes, it’s best to stay away from, the things that they like to bite.
One thing we found neat about swimming at Makua was the holes that occur naturally in the sea floor. They fill with rocks (which are thrown around during hurricanes) and then the rocks are worn into round balls by the waves.
In spite of the lack of sea life, it really is a very pretty beach. If you were going to just sit and listen to the waves somewhere, this might be a nice place to do it.