If you plan on cruising anytime during March or April it's always "Spring Break" someplace, there's no getting around it. So long as it's not "Easter Week" the ship shouldn't be overrun with unruly kids. We always cruise sometime during this period and have found that by booking longer cruises, ie: 10 to 14 dyas, you can avoid alot to the kids because they usually only get a week off.
Queen Mary 2, Canada
Enchantment, Western Carribbean
Century, Western Mediterranean
Jewel, Eastern Caribbean