1. Hotel Portmeirion
Portmeirion, North Wales
The Mermaid Spa in Hotel Portmeirion is a small haven of tranquility overlooking the Dwyryd Estuary. Its treatment menu is carefully curated and includes only the purest vegan products - with everything from freshly made smoothie facials to deep sea aroma massages.
Each spa appointment comes with free entry to the quaint village of Portmeirion, which is on a private peninsula on the coast of Snowdonia. The Mermaid Spa Day includes a two course lunch at the castle and either an Indian head massage, back massage, manicure or pedicure for just £60.
2. Celtic Manor Resort
Newport, South Wales
Nestled in the beautiful Usk Valley in South Wales, only two hours from London, The Celtic Manor Resort is a luxurious destination on a grand scale. It boasts two top-notch spas: The Forum, and Clarins Health Spa - both of which offer a sanctuary for relaxation and the finest treatments from luxury beauty houses.
Overlooking the rooftop terrace, you'll find the luxurious 20-metre pool beneath a simulated blue sky which darkens at night and twinkles with stars. This vast estate - and it 1,400 acres of parkland - is a private and luxurious retreat for its guests, perfect for special weekends away.
3. St Brides Hotel & Spa
Pembrokeshire, West Wales
Overlooking the glassy waters of Carmarthen Bay, the spa at St Brides Hotel is a blissful retreat. Whether you choose a massage, facial, scrub or manicure, you can slide the treatment room's vast windows open for a refreshing sea breeze and uninterrupted views of the water.
As well as taking advantage of the hotel's relaxing spa facilities, guests can easily explore the Pembrokeshire stretch of the Wales Coast Path. Saundersfoot itself has a beautiful, award-winning Blue Flag sandy beach and colourful harbour.
4. Lake Country House
Llangammarch Wells, Mid Wales
Set in the heart of the mid Wales countryside, the award-winning Lake Country House is perfect for a relaxing getaway. Take your pick from its fabulous Mediterranean massages (which are tailored to suit your mood), body scrubs, and signature treatments inspired by the Orient.
Think of this as your very own country house retreat. You can breakfast in one of the richly furnished lounges or out on the terrace, overlooking the hotel's fifty acres of parkland - and dinner is served in the double AA rosette-awarded restaurant, which features open log fires and period furnishings.
Read more: 7 of the best spa hotels in Scotland
5. The Corran Resort & Spa
Carmarthenshire, West Wales
Offering a real taste of luxury and hidden in the marshlands of the Carmarthenshire countryside, an original 16th-century building is at the heart of Corran Resort, which boasts 21 beautifully-designed bedrooms.
The spa is a work of art too, with a swimming pool, whirlpool, modern gym, sauna and steam room, and seven treatment rooms offering the latest in indulgent and invigorating spa therapies.
6. St David's Hotel and Spa
Cardiff, South Wales
Standing above the stunning waterfront at Cardiff Bay like an Atlantic ocean-liner, the five star St. David's Hotel & Spa is a striking landmark.
Unwind and indulge in a little spa therapy right on the edge of Cardiff's trendy waterfront with an indoor swimming pool, sauna, hydrotherapy spa pools, plus a fully equipped gym and treatment rooms.
7. Lake Vyrnwy Hotel
Powys, Mid Wales
Located high on the hill sides of the Berwyn Mountains, this four star Victorian country house hotel offers breath-taking panoramic views of Snowdonia. Lake Vyrnwy Hotel's beautiful spa is highly rated by the Good Spa Guide, with ESPA treatments and a whirlpool overlooking the lake.
Around the hotel you'll find 28,000 acres of woods, fields, water and moorland, with fishing, canoeing, bird watching, and cycling just some of the activities on offer in the local area.
8. Vale Resort
Hensol, Near Cardiff
The spa at Vale Resort has three relaxation zones, each with a bespoke design to help you find your idea of perfect peace. The Thermae Suite is designed to treat your body to heat experiences that will soothe, relax and detoxify, while the sauna offers traditional dry heat which can be intensified by body brushing with birch twigs.
The hot and cold rainforest showers with chromatherapy lighting will stimulate your senses before you give your body a wake up call rubbing handfuls of ice flakes, natural salts and body muds to leave you with an all-over glow.
9. The Quay Hotel & Spa
Deganwy, North Wales
A little nugget of luxury on the North Wales coast, The Quay Hotel boasts fine dining, gorgeous suites, and a fantastic spa with ESPA products. Wallow in the swimming pool or hydrotherapy pool, then purify your skin with a Hammam treatment and rub-down.
You can be as active or as lazy as you like here. The Medieval town of Conwy and Snowdonia National Park are moments away by car, or simply soak up views of the serene Deganwy Marina from your balcony with a cocktail in hand.