Five years ago, I went and felt quite good. Is there still a shower room now?

Yes, you have to wear a life jacket if you’re going to go swimming.
“Some places have outdoor shower facilities with rinse options, while others offer indoor paid showers that are more convenient.”
Yes, you need to wear a life jacket before going into the water.
Here is the translated text:

“Some have outdoor showering with no charge, while others may prefer indoor paid showers that are more convenient.”