Spas are found in the larger resorts. Massage parlours offer facial and beauty treatments without having to have a massage. There are a number near to the Centara on the highway.
Have a look at this link to Miss Miracle Salon, on the opposite side of the highway from the lane leading to the Centara next to McD's http://khao-lak-magazine.com/health-beauty/miss-miracle-beauty-salon/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+KhaoLakWired+%28Khao+Lak+Wired%29
Thanks for your replies.