Spa World — Multi-Floor Onsen Theme Park

**Gender-separated bathing zones:** The European and Asian themed floors alternate monthly by gender (e.g., January: European floor is men, Asian floor is women; February: switch). Check the monthly schedule online before visiting if you prefer specific theme. The bathing zones are fully nude, same-gender only (per Japanese onsen custom). First-timers: wash thoroughly at shower stations before entering baths, no swimsuits in gender-separated areas, small modesty towel for walking between baths (don't submerge towel in water). The tattoo-friendly policy is major advantage — most traditional onsen ban tattoos, but Spa World welcomes all. **Facility highlights:** European zone features Roman-style marble baths, Finnish sauna (90°C+), and Turkish hammam aesthetics. Asian zone has Japanese cypress wood bath (檜風呂 hinoki-buro), outdoor rotenburo with cityscape views, Korean-style jjimjilbang heated floors, and Persian-themed relaxation rooms. The variety prevents bath fatigue — rotate through different temperatures and settings over several hours. The rooftop pool area (swimsuit required, mixed-gender) has water slides popular with families. **Overnight strategy:** Budget travelers use Spa World as capsule hotel alternative — ¥1,500 entry allows 24-hour stay, napping in common areas (reclining chairs, tatami rest rooms) is permitted. Free Wi-Fi, vending machines, and restaurant (¥700–1,200 meals) available. The overnight crowd is mix of travelers, late-night workers, and locals who missed last train. Facilities can feel crowded 23:00–01:00 when bar-district refugees arrive; 03:00–06:00 is quietest. Lockers provided for valuables (¥100 coin deposit, refundable).