I am truly mystified as I've stayed at Andaz Napa, I've spent time on the 2nd floor deck at Andaz Napa, and I don't think there's a pool at Andaz Napa.

Perhaps the pool is on the roof (?) [That's a joke].

At Alila Napa, there's an outdoor pool - it's not a large lap pool, but it's big enough to splash around in - though no hot tub. If you're looking for a "pool experience", Carmel Valley Ranch has two separate pools. Hyatt Sonoma has an outdoor pool but it's not as nice. Alila Ventana has a very nice pool but it can be chilly in Big Sur and their hot tubs have been closed for COVID.