See this would normally be my plan too..but from what I"ve read the park that week can close due to reaching capacity by 11 am or so...so if we take the chance of an afternoon break don't we have to worry about being able to get back in that night?
In my experience, when they close the park for admittance, it's not closed for the entire day. It's usually closed in the morning/mid-day, and then opens up again a few hours later after people have gotten fed up and leave. I've never had a problem with this, even when staying off-site.