Cagney's Steakhouse, on Deck 7 behind the Grand Centrum, levies a $20 per-person fee. Cagney's offers entries ranging from grilled salmon to steaks and chops to whole lobsters.
Le Bistro, NCL's French restaurant (surcharge $15), is located forward on Deck 7. Menu items range from appetizers of escargot in garlic butter to Spirit's version of "surf and turf," which includes four small half-tails of lobster, filet mignon, three sauces and a choice of vegetables. A salad is also offered, including a Caesar salad complete with anchovies, and a spinach salad with pine nuts and goat cheese. The Bistro's most popular dessert, is chocolate fondue: Chunks of fresh fruit are served in a pineapple "boat" and a pot of warmed chocolate is placed on the table for dipping.
The Thai/Japanese/Chinese Shogun ($12.50) serves Asian-fusion dishes such as chicken in green curry, sweet and sour pork, and teriyaki salmon. The restaurant also includes a Teppanyaki room and sushi bar (a la carte pricing applies), as well as a Tatami Room where guests sit on the floor for a traditional Japanese dining experience (it accommodates eight, so make reservations early).
Can't advise on the price for children but as they are speciality options children under a certain age might not be allowed, but perhaps someone else can clarify this one further for you.
I certainly don't think that children are half price! I think that you will find that everybody who eats in the restaurants pays the same price, but that there is an age limit. I am not positive, but I think that you will find that children under the age of around 12-14 years are not allowed to eat in some of the surcharge restaurants. Happy cruising.