We stayed just one night for the FOTL perks. We got it both days, all day.
Now, we had 5 adults, and we had to pay a $25 extra person charge for our room... 5 people that included children are included, I believe, but we were all adults... still worth the extra cash. They do ask for ages, so just be prepared if you have 5 adults you might have to pay an extra $25 for that 5th person. And I would think that if an adult walked up with a child roomkey, that someone might get suspicious and question ID. Just a thought.