With 28,000 square feet of luxurious space, the relaxed atmosphere of Horizons at Black Diamond is a perfect setting for a gracious get-together with friends, a cool drink after a hot round, or an elegant evening of distinctive dining.      And when it comes to sporting and social activities, the Club Concierge, Dianne Dunnigan, offers an array of exciting events throughout the year.      Surrounding Citrus County features a world of scenic fun, from sparkling springs and rivers to pristine parks to beautiful beaches. And all of the famous attractions in Tampa and Orlando are less than 90 minutes away.      Black Diamond life. Perfect. Naturally.