Depends on the line -- most cruise lines won't accept college bookings without adults being present. Check out what cruise line you are sailing, and see the age requirements. Carnival doesnt allow drinking or gambling until 21, rcl allows beer and wine at 18 and casino at 18 -- IMO if i were a college age kid, I would chose the line with the lower age requirement. I've sailed Celebrity at Easter Break, and kids on board was not a problem. Remember that colleges have spring break at varying times -- I think kids looking for a more party atmosphere will chose land vacations, so in general I think cruises are more family oriented. You will see many families on board most ships around Easter time.