The long held myth that milk is the best thing for healthy bones is not true. Many confuse "dairy" with "calcium," and assume they are the same thing. Dairy products contain calcium, but so do dark-leafy greens. Milk is fortified with vitamin D, but bone health goes beyond calcium and vitamin D.
Vitamin K is important for bone health (dark leafy greens have it, dairy doesn't). Magnesium, also missing in dairy products, plays an important role in bone health.
Milk isn't the only, or even the best, source of calcium. If you're looking for good sources of calcium and Vitamin D, consider dark greens, mustard greens, kale, and bok choy instead of milk. Toss in some almonds, cashews, and potatoes for magnesium.