There are I think 5 guest slips in Newport Beach on a first come first serve basis. Last time I pulled in, it was $1 a foot per night, and they are right next to the Harbor Patrol Office. The only problem is that they get used a LOT!
However, the best kept secret on the West Coast is that there are a ton of moorings available in Newport Harbor and at a grand total of $5 per night regardless of the size of your boat. Best part, according to the Harbor Patrol, they have never run out of moorings even on Holiday weekends. The Harbor Patrol is great in helping get you situated. Only two things to remember about Newport Beach:
1. The moorings are set up with two cans, bow and stern. So bring two long lines to use. I usually grab the can on the bow with a boat hook and pull it up, pass a line through the eye on the can, cleat off on either side of the bow using both bow cleats, back up to the aft can and repeat. You can then adjust your position to the middle between the cans.
2. There are no shoreboats so you need a dingy to get to shore. The only dock is next to the guest slips, behind the pumpout station. A couple of the restaurants have a guest dock that you can tie up to if you are dining there.
Great place to people watch. The harbor patrol is the copper-roofed building on your starboard side about a mile in from the entrance. Just pull up to the long dock and go in. Bring a copy of you doc papers or registration and a photo ID.