Luxury Spa Experience on the Ayrshire Coast

OPEN NOW

Si! Spa at The Waterside offers a luxurious seafront wellness retreat in West Kilbride, Ayrshire. Designed to embrace its spectacular coastal setting, Si! Spa brings together immersive thermal experiences, bespoke treatments and indulgent spa break packages for every type of guest.

Our water’s edge haven features six treatment rooms, offering an extensive range of therapies using ESPA and ishga, renowned for their holistic benefits and natural ingredients.

Our thermal experience includes a steam room, experience showers, heated benches and relaxation areas. Outdoors, our hydro pool and sauna overlook the Firth of Clyde, delivering a truly tranquil escape where sea views and fresh coastal air enhance every moment of relaxation. Enjoy our heated outdoor relaxation area with fire pits or take a stroll along the beach with direct access from the spa garden.

Our spa restaurant and lounge serves breakfast, afternoon tea, light bites and cocktails, with indoor and outdoor dining.

Treatments

View the range of treatments at the new Si! Spa

Choose your ideal treatment in the expert hands of our experienced therapists. Guided by your personal needs, treatments make use of nature’s most powerful and effective oils, coupled with the latest, innovative techniques. Allow your body to feel fully rebalanced and restored. All treatments will include full use of our spa facilities at The Waterside.

TREATMENT OF THE MONTH

From £110

 October: ishga Tides of Change

80 mins | From £110

Transform your skin with this results-driven facial, designed to detoxify, sculpt, lift and restore radiance. Combining pre- and probiotic technology with Japanese Kobido-inspired massage and stimulating jade rollers, skin is left feeling firmer, lifted and beautifully glowing

Both packages include a one-hour Thermal Experience prior to treatments.

October offer valid until 31.10.26. £110 per person – Mon-Thu, £130 per person – Fri-Sun

November: ESPA Back, Facial & Scalp Ritual

80 mins | From £110

Escape into complete relaxation with ESPA’s renowned head-to-toe treatment, designed to release tension, restore inner calm and leave you beautifully radiant. Enjoy back exfoliation, a soothing back, neck & shoulder massage, personalised Inner Beauty Facial and relaxing scalp massage.

November offer valid until 30.11.26. £110 per person – Mon-Thu, £130 per person – Fri-Sun

Both packages include a one-hour Thermal Experience prior to treatments.

Day Spa

Relax, unwind and indulge yourself at Si! Spa by enjoying one of our luxurious day spa packages. Every package includes full use of our beach front spa facilities, a range of treatments and dining options including breakfast, afternoon tea and light bites.

SPA BREAKS

View the range of Spa Breaks at the new Si! Spa

For a little extra indulgence, why not enjoy an overnight spa break at The Waterside. Stay in luxury accommodation, enjoy full use of our spa facilities and choose from a range of relaxing treatments. Why not add on dinner in restaurant within the hotel to complete your package.

Si! Spa Thermal Experiences

From £45 per person

Our range of Thermal Experiences includes the use of plush robes and towels, along with full access to Si! Spa’s facilities. All packages includes a relaxing two-hour Thermal Experience featuring a sauna, steam room, experience showers and a tranquil relaxation space.

With a strong connection to the outdoors, guests can unwind while taking in sweeping views across the Firth of Clyde from the outdoor hydro pool, outdoor experience showers and sheltered fire-pit area, offering a peaceful escape from everyday life.

Packages available Monday to Thursday from £45pp, and Friday to Sunday from £55pp.

TO THE SEA

From Si! Spa to the sea

Guests at Si! Spa can enjoy direct access to the beach from the spa garden. Enjoy a stroll along the beach in your robe, dip your toe into the sea and take in the scenery.

Beach Access 

  • Access to the beach and sea is unsupervised and entirely at your own risk.
  • Only enter the water if you are a confident swimmer and comfortable with cold-water exposure.
  • Please be aware of natural hazards including tides, currents, uneven ground and cold-water shock.
  • After sea immersion, take time to warm up and acclimatise before using the sauna, steam room or hydro pool to avoid dizziness or fainting.
  • Guests should not enter the sea under the influence of alcohol or if they have any medical condition that may be affected by cold-water exposure.
  • SimpsInns accepts no responsibility for injury, illness or loss arising from use of the sea.
  • By accessing the beach, you accept responsibility for your own safety and wellbeing.

SPA MENUS

Tasty dishes and refreshing drinks at Si! Spa

Click on the links below to view some of the Si! Spa menus and drinks list, specially created for you during your time with us at Si! Spa. Choose from the tasty breakfast menu, enjoy a poke bowl or afternoon tea, or an extensive selection of cocktails wine, soft drinks, hot drinks and more.

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