Hi riu girl. I actually went online to check availability and pricing at the Comfort Suites for our night (standard internet rate as I couldn't get the Park/Fly rate online), and it gave me a bunch of pricing and options, but some rooms did come up with "We're sorry, this room can only be booked for 2 people" or something to that effect. They must have some rooms that are blocked off just for 2 max, and some that can accomodate more people, and perhaps they just weren't available on that night for the Park/Fly rate.
I looked up the Clarion and it looks fine, and the reservation agent told me that Clarion is actually at the top end of the Choice Hotel chain, so I'm sure it'll be fine for us, especially just for the one night. I'll use that saved $20US to buy something fun in the parks :-D