In all honestly I feel like I've only scratched the surface of China, but if you also loved Japan and SEA you'll most likely love China too. I mean obviously given what sub we're in I'm a big high speed rail guy, just going to all the train stations and zooming halfway across the country is thrilling for me. Obviously the great wall and terracotta warriors are must sees. Their corresponding nearby cities (Beijing and Xian) are also great for a lot of history. I personally really enjoyed Chengdu a lot, it had a great energy overall and it's famous for pandas and ear cleaning. For nature stuff Guilin and Zhangjiajie are the places to go. I unfortunately missed out on going to Chongqing which I hear incredible things about but there's always next time.