One of the most beautiful resorts I've ever been to! Peaceful, calm, serene, relaxing, luxurious. Get the sea view villa! It has the most amazing views - even from the shower! And one of the only places on Ko Samui where you can see the gorgeous sunsets (you can't do that on the East Coast in Chaweng). You don't hear your neighbours as you are in your own little paradise bubble. Very romantic if you're there with a partner, I imagine (I was on a solo trip). There were a few young families with children but they didn't make much noise at the pool.
Lovely private beach (a bit stoney here and there), gorgeous infinity pool, air-con great, Wi-Fi perfect, free fun activities like yoga, cycle tour, Muay Thai class, cooking class, free beach bag & flip flops.
As the resort is a bit further away from the hustle & bustle of Bophut and closer to the jungle, it does take a about a 15 min taxi ride to tourist attractions. But I chose Napasai to relax, so I was fine to stay at the resort for the first half of my Thailand trip. I enjoyed being away from large groups of tourists.
Surprisingly I was not bitten by a mosquito once but I made sure to wear strong insect repellent with DEET. The resort does spray insect repellent once a week all over the grounds, so maybe that helped as well.
Lastly, the resort has the most attentive staff I've come across. Friendly, helpful but also know when to leave you in peace and quiet.
I highly recommend Napasai!!!