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It looks like those are the waterside pieces of the four-person family raft slide that didn't get built:
Sources: https://m.weibo.cn/2733921017/4648024133604616 and https://m.weibo.cn/1771522350/4648846817236022 and https://m.weibo.cn/5653289328/4648684400414132 and https://m.weibo.cn/2886760110/4650203405354237 and https://m.weibo.cn/2077432315/4649858864251315 and https://m.weibo.cn/1634614497/4650290814913700
Source: https://v.douyin.com/exUPF6L/
A very futuristic sign for a very tropical/undersea themed waterpark:
Sources: https://m.weibo.cn/status/4644817362227516 and https://m.weibo.cn/status/4644818548425326 and https://m.weibo.cn/status/4640800166906921 and https://m.weibo.cn/status/4645197683888772 and https://m.weibo.cn/status/4643325967864817
Installation of the first roller coaster has begun at the theme park! It looks to be a family coaster by Jinma Rides:
Sources: https://v.douyin.com/eajNuV6/ and https://v.douyin.com/eaxh63M/
Maurer just announced a Spinning Coaster (SC3000 model, Motiongate's Now You See Me: High Roller clone) for Sunac Cultural Tourism City.
Source: https://maurer-rides.de/en/haiyan