There are always plenty of places to sit by the pools, but if you want really close to them, the kiddie pool, and family pool are busy from the moment they open in the morning. So if you want up close I'd be there when they open. With the adult pool we have seen empty chairs, by the pool all the time. Not as many people go there as the family pool.
Also if you have late dining, the pools will be more empty while people are at early dining. Or if you have early dining, and don't care about the show, go right after dinner, as most other people are either at dinner, or have gone to the show. Most kids are in the kids clubs in the evenings. You can actually have an entire pool or hot tub all to yourself if you go in the evening.
And if you want to see the show too, it does repeat on your TV in your room for 24 hours. Or go to the show and then go to the pools while people are at the clubs. It is great to have the entire place to yourself. We have done this a few times.
mom x4,grandma x4