Yes, we have! We call our Riley, RileyRoo too, that's right. Too bad our trips won't overlap! I know my Riley would love to meet another Riley!
Captain Cooks was good, standard fast food, but with a good selection. They have a grill, prepared foods in a fridge and snacks. They also have refillable mugs (which I am drinking out of right now at my desk!) for the soda fountain. You can also get take out food from Kona which is great. They also have an in room dining menu. They have life jackets at the marina to borrow, I think you need to leave your room key as "security" but I'm not sure. The pool is "zero entry" so we never used life jackets with our DS's. Riley was 18 months and 2.5 when we visited and Meghan was 4 and 5 on our visits. They both did fine without them.
You can rent all types of watercraft there, including watermice. My DH rented one last December and took our 5 year old nephew out with him. They had a great time!
Also you can visit the Neverland club during the day with no charge, as long as you remain with your kids. I've never been inside the arcade as our kids have been a bit too young for that.
Big tip! Make friends with Auntie Kaua (spelling???). You can find her at the Island Guide station in the GCH most days. She's the older Hawaiian lady and she is FABULOUS. She was one of the reasons we fell in love with the Polynesian on our first visit. Meghan took Hula lessons on Saturday morning with her class and she coaxed me to join in, I think it was one of the highlights of our trip. They do children's activities every day in the GCH or pool area. One day we made Christmas ornaments for our tree and another the girls strung lei bracelets for themselvs. I can't say enough about the recreation staff, and most especially Auntie! We cried when we had to say Aloha to her =( But we can't wait to see our Disney 'ohana in May!
I second (third? fourth? millionth?) the comments about Steve Tikiman's FABULOUS site. It may be the very best resort site out there! I found every single bit of information on his site not only to be helpful, but absolutely current and correct. That is truly a labor of love there!
I'm not sure which longhouses are missing the second floor balconies, we had one on our third floor Figi room and our third floor Tokelau room.
You will have a GREAT time!
Aloha!