We just got back a few weeks ago and my best advice is to be flexible. I originally tried to get a few dates in early June and finally gave up. I couldn't get enough nights in a row in the same type of room. I ended up being able to book 4 nights for 4th of July week in a 1 bdr standard view. I didn't mind the view and the fireworks were incredible!
You really need to read up on the threads about how to book online. It is really important to be online a few minutes before it starts and only book 1 person in the room. Call back later to add the other people The day I finally got 4 nights in a row, there were several choices to book such as studio ocean view or several 1 bedroom options.
It is a wonderful place! I would love to go back next year.