You could proposed in your underwear in the middle of a trash heap - all she wants to hear is that you love her and want to spend the rest of your life with her.
But if you really want 2 cents - stay away from the the cliche' places that she'd expect (Castle in the clouds, Church Landing, the Mount, etc) Put the ring in your pocket for the weekend and the moment it should be will happen for you. It maybe just sitting on a bench in downtown Meredith.
Good Luck whatever you decide - she'll love you for the thought.