After the first use of each of the hot springs, your maximum health will increase by a minor amount. There are 18 hot springs spread across the island - 9 of them are in Izuhara, 6 are in Toyotama and 3 are in Kamiagata.
When you rest in all 18 hot springs, you will get a new outfit - Fundoshi (Running and sprinting no longer create noise).
"A true samurai needs no clothes."
- Jin Sakai after too much sake
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