I would call directly to book for more than two people per room. While most rooms have two double beds, some have a queen or even a king.

To be honest, I wouldn't put more than two people in a room. Even though you aren't there much, it seems like it would be a tight fit for four people. That doesn't mean you can't do it thought.

For anything over three people, you get the N/A notice, as you discovered. Calling directly would help you book the most appropriate accommodation for your family.

I have to call to book my next stay because there isn't anywhere to book with my pineapple perks points. I've always had good luck with calling the toll free number directly.

Good luck! I really liked the grand pineapple.