Bathhouses are very popular in Japan and while I was living there I loved going. I didn't have a chance to go earlier on my trip, but Centrair Airport has a bathhouse so I decided to take a bath prior to catching my flight home. 
Japanese baths are a little different than what I was used to back in the US, particularly that you wash before getting in the bath so that the water keeps clean for everyone.
Upon paying I got issued a key for a locker in the ladies changing room. Typically there are seperate bath facilities for men and women.
After undressing and stowing my things in my locker I went out to the washing area. A typical washing area consists of mirrored stalls equipped with a handheld shower head and stools to sit on. Additionally, shampoo, conditioner, and body wash are provided along with a bowl that you can fill with water and dump on yourself for rinsing.
Once I was squeaky clean I went to soak in the hot bath and enjoy the view. It was really relaxing and I could watch the planes taking off over Ise Bay. I had the bath to myself so I couldn't resist sneaking a few pictures.
Unfortunately I had to catch my flight home so all too soon I was rinsing off again and heading back into the changing area to get dressed and dry my hair. After a long work week and with a twelve hour flight ahead of me that hot bath was just what I needed.
If you are interested, check out the rest of my December 2011 Japan Trip here: Visiting Hieizan Enryaku-ji, Kobe: Luminarie + Beef, Autumn in Kyoto, Favorite Eats in Toyota-shi, Centrair Airport Bath