Utah's crowded Zion National Park may require reservations

I think an hour based system is horrible, and a daily system is still a bit limiting, perhaps allow a 3-5 day pass which would allow for changes of plans and to accommodate things like inclimate weather, travel delays, etc. Then you fight the reservation abuse problem by allowing first come first serve if a certain percentage of reservations haven't used by hour X (or perhaps better allow some first come first served every day and increase the pool if reservations go unused). It's not like the park can only accommodate 25k visitors a day and 500 more makes it not work.

Btw when I talk about flexibility I'm thinking of my upcoming trip, originally it was only going to be me, the wife and our two boys but my niece heard my wife and sister-in-law talking about the trip and begged her way to coming with us, if you had a hard reservation system we'd have to what, leave her in the trailer while the 4 of us went into the park, that seems a bit too harsh.