Hi Madysmom ...
We've been staying at the poly since our kids were fairly young (6 months, 3 and 7) ... we're now heading back for our last trip next month and they're now 11, 14 and 19 ... time sure flies!)
My recommendation for you would be to get a first floor room at one of the longhouses that has a grassy lawn area for the kids. We've stay at Aotearoa (sp?) for our past 5 visits and have requested it again for this trip. We get garden view ... but I know they have some lagoon views as well. What you'll find when you request a first floor room with the little ones is you won't feel so boxed in (although the rooms are great size!). Especially for a little one who you might like to toddle around ... the extra grassy space we found was a god-send! It also made it so easy taking the kids back and forth to the pool if my huband and I were doing separate trips with them (ie: hubby would head to the pool with 2 of them ... I'd keep the youngest behind for a nap). No stairs to climb ... quick and easy.
Enjoy your trip ... for our family it's been simply magical!