Unique 50th Birthday Party Ideas?

I know of a lady who I only know on Facebook and would like to surprise her with a unique 50th birthday party. Her favorite color is black she suffers, like me, from fibromyalgia and spinal illness which causes chronic pain due to this illness. Many family and friends often don't understand so they tend not to extend invites to social gatherings, because weather plays a bad roll on how we suffer. However her birthday is in August and summer is a great time because the warm weather helps our body pain. I know she wants a horse and carriage ride, wants to let go of 50 balloons, and she loves the color black. She is a lovely soul and cares for anyone. She loves life and has a great sense of humor. I need help! Please.