If you get additional rooms keys, you should be able to bring your guests in. When we were at BCV, we were told that we could bring as many as the room would allow. And that if we wanted to bring more - we would have to check with the lifeguards. If the pool is at capacity, then they probably wouldn't allow non-keyed guests. It wouldn't be fair to the guests staying there.
So, I'm not 100% sure like the prior poster, just sure that if there is room and/or you have a room key for them that they could come with you.
And I'm told the S/D pools aren't much anyway. I've walked by the Swan going to the minigolf and it's just a pool. Didn't see a slide. It was rectangular, no theming in sight etc.