To make an appointment with a masseur ask the Pearl Villa staff. They can show you a list of options. An hour or two's advance notice would be appreciated or plan ahead and book the evening before. Prices vary according to the length of time booked & the kind of treatment required.
There are beauty spas on Gili T but we leave it up to you to choose if you want to visit them.
If you are a Yoga enthusiast there are multiple options & classes/sessions not far from GPV. Gili Yoga is a good place to start.