San Antonio Texas spa resort – Lantana Spa at the JW Marriott San Antonio. The concept of healing waters and beautiful views will leave our Spa guests refreshed, rejuvenated and inspired. The 26,000 square-foot Spa will offer 30 treatment rooms, including two couples treatment suites with fireplaces. Two outdoor private treatment rooms are available. A complete fitness center will feature the latest in cardio-training equipment, free weights, and stationary weight training equipment. A fitness studio will offer exercise, yoga, and fitness classes. Between treatments, enjoy the peaceful serenity of the private, lagoon-like, spa pool or enjoy healthy refreshments at Replenish Spa Bistro.