We went last May and it was the same price for adults and kids, my twins were free as they weren't old enough to need park tickets.
We loved it, and are going to do it again this year. It's basically a scavenger hunt through the park. We met two characters and got to go in the fastpass line for a ride. They also give you free bottled water at the start of the tour and there is one break in the middle. Our tour guide was fantastic and really did a wonderful job of making sure all the kids got involved and helping them to figure out the clues if they weren't sure or weren't familiar with the particular movie/character that the clue involved.