public bath

Onsen is like a public bath.

A 'public bath' has become a place of relaxation for people now.  It is an area of warm water that was used for public sanitation in the past. Notice the following:

1. Public baths are very popular in Turkey.
   
2. Did you visit a public bath in Japan.
   

of course

The men and women are in separate areas, of course.

We add the phrase 'of course' when a statement is obvious or we want to draw attention to it. Notice the following:

1. Of course, you have to remember that he is just a kid.
   
2. You will still have to be careful of course.
   

relaxing

These hot baths are very relaxing and very healthy.

If something is 'relaxing' it helps relieve stress and tension. Notice the following:

1. I just want to have a relaxing night at home.
   
2. The massage and the tea were very relaxing after a long week at work.
   

flavor

They have different kinds of baths with different flavors.

A 'flavor' is a taste that something has.  For example, candy can taste like fruit or have fruit 'flavor.' Notice the following:

1. This candy has a familiar flavor, but I can't think of what it is.
   
2. This soup has excellent flavor.
   

minerals

Some baths have minerals like sulfur or radium.

A 'mineral' is a substance that naturally occurs in nature.  Many time people create mines to take some of these minerals out of the earth. Notice the following:

1. Fresh vegetables are full of vitamins and minerals.
   
2. He uses natural minerals in his jewelry.