At The Runnymede on Thames - Adults Only, you'll be within a 10-minute drive of Windsor Castle and Thames River. Guests can visit the spa to indulge in deep-tissue massages, body wraps or facials, and British cuisine is served at Leftbank, which is open for breakfast, lunch and dinner. Other highlights include 3 outdoor tennis courts, an indoor pool and a bar/lounge. Fellow travellers say great things about the helpful staff and breakfast.