I haven’t stayed at Riviera, but I am a kind of anti Disney person and was surprised how much I liked the Polynesian. Once you walk through the lobby back toward to pool, it feels very lush, green, and calm. Basically everything that the parks aren’t
Our kids LOVED it, and we have been lucky enough to stay at very nice hotels around the world. Don’t sleep on the Ohana brunch, either- it was my kids’ favorite character meal (and we did several, including in the castle)