Not sure what time of year you are going, but the theme pool (one with the slide) at the GF is not open all the time. It opens up at 10am, but can close anywhere from 6 to 10pm, depending on the season. The courtyard pool, which is open all the time is huge and has a hot tub. I don't really know much about the Volcano pool hours or the secondary pool at the Poly, only that there is no hot tub available there. The GF has 4 cabanas, 3 of them are available for 1/2 or full day rentals. They come with a fridge, stocked with soda, juice and water, tv with dvd player, supposedly wireless connection, table and chairs, plus 2 padded lounge chairs. The 4th cabana has some regular lounge chairs and a table, it's first come first serve.
The overall Poly theme may appeal more to teen boys though.