Hi Paola. While not every spa and salon listed on Wahanda accepts our Monetary Gift Voucher, there are more than 600 spas, salons and gyms across the country that do - more than any other voucher, so you should be able to find something that's right for you.
The best way to search is to use the map on this page: http://www.wahanda.com/the-wahanda-gift-voucher/
and then filter your way to what you think is right.
Hope that works!