CHOC Children's is proud to offer one of the most technologically advanced and compassionate pediatric surgical experiences in California at the Tidwell Procedure Center. Patients must arrive at CHOC Children’s two hours before surgery is scheduled to begin. Caregivers should park at the main entrance of the hospital at the valet stand. The valet stand opens at 5:15 a.m. and the valet parking and service is complimentary for one car.