I've noticed that a lot of people expect their kids to travel for free - whether it's staying at a hotel or coming on a boat tour. I think it's fine for babies and kids 2 or under, but actually a lot of times kids are more work than adults!
I looked up Disney World's prices, and children do get a discount - but it's only a few dollars:
http://www.wdwinfo.com/wdwinfo/tickets.htm
What do you think: should kids get a discount when staying at hotels, going to theme parks and going on tours? If so, how much - and when should kids start paying full price?