The Arnold Arboretum is sponsoring a Winter Wellness Walk on Sunday, December 9 beginning at 1 pm.  Enjoy the landscape pared down to its beautiful bones.  The walk emphasizes fitness, with a healthy dose of information on seasonal highlights.  In case of inclement weather, contact 617-384-5209.  The activity is free. Meet at the Hunnewell Building.  For more information, visit www.arboretum.harvard.edu.