The design of a small SPA club involves creating an inviting and relaxing environment that caters to the needs of patrons seeking relaxation and wellness. Key elements include comfortable seating, calming color schemes, soothing music, and well-lit, airy spaces. The layout should facilitate privacy and tranquility, with separate areas for treatments like massages, facials, and saunas. Additionally, the design should incorporate eco-friendly materials and sustainable practices to enhance the overall experience.