A towering oak tree stands watch over the newly constructed Meadowood Spa, an all-suite spa at Napa Valley’s charming Meadowood Napa Valley resort. Inside, rustic reclaimed-wood beams and a fireplace, accented with hand-forged steel, mirror the muted olive-green and brown colors of the surrounding forest. Fountains made of wood, steel, and stone lead the way to the spa’s standout feature: eight individual treatment suites, each equipped with private bathrooms, steam showers, built-in lounge areas, and sliding …