The various opinions here don't really matter. What matters is what the three adults involve think.
What do you think? Would you be happy with either split? Then talk to the other two adults.
If you can't talk about splitting the room costs, how will you be able to negotiate everyone's various desires/expectations throughout the parks?
Either way is fair if the parties all agree it's fair. Put it all out there beforehand and you'll be much happier! And if you all can't agree, you might want to reconsider traveling together.
What do you think? Would you be happy with either split? Then talk to the other two adults.
If you can't talk about splitting the room costs, how will you be able to negotiate everyone's various desires/expectations throughout the parks?
Either way is fair if the parties all agree it's fair. Put it all out there beforehand and you'll be much happier! And if you all can't agree, you might want to reconsider traveling together.