The park itself is also pretty cool. They have basketball courts, baseball fields, a track, and the pool. The only downside would be that there are usually events scheduled so you need to know when to show up (i.e. lots of games scheduled on weekends). But to have such a great (and free) place in the middle of Manoa is perfect. I've heard some people say that the fields could be better maintained, but the pool was in perfect shape. So I'd say for a community park/pool, you can't beat this place.
I am particularly excited to have found the pool because now I don't have to rush to the beach immediately after work to get in a swim before dark. I also don't have to deal with dirty, gross water and sand in my ass crack. It's the perfect solution. Now yes, swimming in the ocean is different, and harder, than swimming in a pool. The current and tide wreak havoc. However, for the Lanikai Triathlon, I swam at best once a week for 20 minutes in the ocean (and not at all the month prior to the triathlon). Swimming in a pool is better than doing nothing. I also plan to swim once on weekends in the ocean, so that should be all right. So the current plan is to run to the pool, swim, and run back. I'm out for blood in the next one.