The funny thing is that Disney actually did have the rights at one point but sold them to New Line. Haha
Anyway, there would definitely be Lothlorien and Rivendell restaurants. There would have to be some nice hobbit-ish and man-ish pubs. There should be a hobbit hole cafe, which, of course would be in a real (larger scale) hobbit hole. There would be a take-a-photo-as-a-middle-earth-character shop. Elven archery, for ages twelve and up, would be a nice touch.
Ooh, there must be a virtual reality "Flight to the Ford" ride on a mechanical horse. {movie or book version?} You would feel the ringwraiths breathing on your neck as you hurry to escape them. All the time being surrounded by their shrill calls. Then when the river washes them away you would feel the spray of the galloping waters.
What about a barrow-downs walk through? *eek*
With Barrow Wights coming unsettlingly close.
There could be an Emyn Muil maze!!!! All the time with random hints of, "Follow us quickly this way, precioussss." Coming from a hidden speaker system.