Orange County weddings sort themselves into two kinds. There is the coast, where a small ceremony sits on a bluff at Heisler Park or Crescent Bay Park in Laguna Beach, or on the grass at Lantern Bay Park above the Dana Point harbour, and the ocean does most of the work. Then there is everything inland, where Rancho Las Lomas out in Trabuco Canyon or The Estate on Second in Santa Ana gives you walls, shade and a guest count that can double. Couples usually know which of the two they are before they call anyone.
The licence side is simple here. Marriage licences come from the Orange County Clerk-Recorder Department, they are issued the same day with no waiting period, and they are good for ninety days from the date on them. You both need to be eighteen or older. There is no residency requirement, no citizenship requirement and no blood test. You can fill the application in online before you go, which makes the counter visit considerably shorter. Time the pickup so the ninety days covers your date rather than expiring the week before it.
Early summer on this coast behaves the way it does further south. The marine layer settles in overnight through late May and June and often holds until the early or middle part of the afternoon, so a noon ceremony at Crystal Cove or Little Treasure Cove can be grey and cool while Trabuco Canyon is already hot and clear. That is not a reason to move the date. It is a reason to set the ceremony late enough that the sky has made up its mind, and to ask your photographer what they do with flat light.
Parking is the honest problem. Pacific Coast Highway through Laguna backs up from late morning on any warm Saturday, the lots above the bluff parks fill early, and the street spaces turn over slowly enough that guests will circle. Older family members will be the ones walking furthest from wherever they end up. Name a specific lot in the invitation, look at a shuttle from one hotel if the guest list is large, and build fifteen minutes of forgiveness into the start time.