Centara Villa Samui, Hua Thanon
One of the places that I've visited various times through my work and I used one of their pools to teach diving.
The hotel is beautifully located in the unexplored Southern part of Samui, on Natien beach, south of Lamai and near Hua Thanon. The Butterfly Garden is opposite the resort and the Aquarium is a couple of stone throws away.
The resort is build on a hill, so be prepared to walk a bit and use stairs in order to get around . They have two pools, the larger one over looking the ocean and the beach and is in a nice small bay; Na Khai Bay.
One thing to keep in mind is that Centara Villas Samui is in a quiet but remote location, if you're looking for exactly that, this may be the right place for you since they have 2 restaurants and 2 bars on the premises for your convenience. Knowing Centara's standard, it will be good but during the evening and night time there's not much going on. Lamai will be the nearest place with some action and activities.
Looking for a nice and quiet location, look into staying here from good Garden View Villas to Pool or Spa Villas with your pool, there's something for every budget.
Booking by Hotels Combined
Booking by Agoda
Booking by R24