The Spa is located within the area of the Railroad.
There are two changing rooms - one for women and one for men. You can enter the changing room opposite to the players gender, but only after attempting to enter several times in quick succession from the pool area.
The Spa is the location for certain events with some NPCs.
Livin' Off The Land Tip
There's a tips channel show describing the spa:
If you glitch into the spa area you can use the Return Scepter while in the spa water it will send you back home submerged in water, when standing still you regenerate Health and Energy as if you were in the spa, alternatively you can glitch into the spa area and put a fence post right where you drop into the water and drop then leave the spa water you will be able to walk out of the spa submerged in water having the same effects. You can drop back into the water to be normal, you can also exit the game, pass out, or get knocked out to get back to a normal state. Note, this does not effect your speed at all
|Merchants||Abandoned House • Adventurer's Guild • Blacksmith • Carpenter's Shop • Casino • Fish Shop • Ice Cream Stand • JojaMart • Medical Clinic • Marnie's Ranch • Oasis • Pierre's General Store • The Stardrop Saloon • Travelling Cart • Wizard's Tower|
|Houses||1 River Road • 1 Willow Lane • 2 Willow Lane • 24 Mountain Road • Elliott's Cabin • Farmhouse • Leah's Cottage • Mayor's Manor • Tent • Trailer|
|Farm buildings||Farming||Barn • Coop • Greenhouse • Mill • Shed • Silo • Slime Hutch • Stable • Well|
|Special||Earth Obelisk • Gold Clock • Junimo Hut • Water Obelisk|
|Other buildings||Community Center • Museum • Spa • Witch's Hut • Dog Pen|