Hycatite Hut Hotel

A place usually booming in business, Hycatite Hut Hotel is home to one of the most unique hotel experiences in all of Crescent Island. Although rather pricey, it grants you access to its luxurious underwater bedrooms and all-in-one facility services that tourists and even residents crave.

Main Game
See: Chapter 2

In summary, Mario and his partners book the hotel for the amount of time they're staying on the island. All of them get to know each other more during this time, and during their stay Mario learns from Mayor Andee about the Island's brief past and his suspicions with the sudden change in inscriptions and drawings depicting the island deities.

Post Game
In the post game, characters from the previous Paper Mario games have rented several rooms. Kooper and Sushie share a room and catch up with one another, and Admiral Bobbery and his gang of pirate misfits can be found in another room.

Trivia

 * Hycatite Hut Hotel is based off of Hyaloclastite, which is "a deposit formed by the flowing or of or into water, ice, or water-saturated sediment and its consequent granulation or shattering into small angular fragments."