Get there a little before park opening. We went on December 28th and stood in a 35 minute line because they are redoing the entrance gates and only had 3 lines to get in.
Our favorite part of the day is feeding the dolphins, sea lions and rays. We get in line to purchase food about 10 minutes before the window opens.
Don't wait until the last minute to get a seat for the shows. We were turned away about 20 minutes before the dolphin show was set to begin because the stadium was full. Before every show, vendors are there to sell drinks, snacks, hats, towels, rain ponchos...
The first attraction we hit is Atlantis. The waits can get long in the afternoon, but are usually under 10 minutes in the first half hour.
If you have specific questions, please ask. We had a pass in 2006 and visited many times.