Happy 20th! That's fantastic!
DH and I took several family members with us to AKL this summer, and I thought it would be a great place to stay for an anniversary or honeymoon. It's a wonderful hotel with great CMs and food. It has a very quiet, dark feel to it-- very romantic.
Be sure to tell the CMs at the hotel and at restaurants it's your anniversary. Sometimes you get special treats.
Whatever you choose, I know you'll have a wonderful time. You really can't go wrong spending your anniversary at the World!