It is a show, that includes live action, projected animation, water, fire, music, etc. There are really no words that describe it. It is held on the rivers of america/ tom sawyer island. You'll sit on the ground at the edge of the water, in New Orleans square. For the first showing you would want to get there 1-2 hours in advance. For the later showing you can get there about 30-45 min in advance and be fine.
There is also reserved seating. Its $59 per person and includes desert. There is seating on the balcony of the art gallery (holds 21 people, and has more upscale desserts served). Or Riverside seating. Riverside has more causual snacks, and offers a $10 discount for children. If you are interested you will want to reserve exactly one month in advance, by phone with a credit card. It is non refundable.