In the past we've stayed at the Doubletree Suites near DL, but for this visit we are staying with relatives in San Diego and driving up for a day visit. If we want to be standing at the gates when the parks open, how early should we plan to arrive at the parking structure (allowing for parking, shuttle, etc.)? We are planning on Friday, Feb. 1. Is it possible to walk from the paking structure to DL? How long would that take? I know there are several parking structures. Is one better than the other or doesn't it matter? Thank you for any advice.