DON'T DO IT!!!!
Especially if you will be out at a park all day and tired!
We have Christmas Eve dinner there in 2015 and had an ADR around that time. We waited to be seated for about an hour (which I hear is a norm) and during that time there was no where to sit because EVERYONE was waiting about an hour past the ADRs to be seated. The were out of the bread, the wait staff was busy and slow, we were only brought skewers once the whole long time we were seated...not worth a late ADR again!
We went the trip after that and had one of the first seating of the night and it was a completely different experience!