Ignore the naysayers.
By the time you arrive and get through immigration it may well be 9am. Head to the CCR and grab some breakfast. Then book a cabana from 10-2 and get some rest. Or at least some quiet and a shower. Following this arrange a spa and have a leisurely lunch, parhaps taking a walk through the tunnels to stretch your legs. A few cocktails at the bar and it will soon be 6pm.
This comes from somebody who arrived at CCR at 10am this morning with a departure at 8.40pm. I am happy!