Once you get to LA, your "vacation" has officially started.
My advice is....don't be in a rush to get to the ship.
Sleep in, have time to recoup.
Traffic won't be as bad on a Saturday.
You will be less than 1 hour away......and the best time to arrive in Long Beach is 2 - 3 pm.
Rooms on the ship aren't ready until 1:30 pm.
Once onboard.....my favorite are the Serenity area (decks 12 & 14) and the aft pool area.
Most of the time, luggage will be at your room before 5, so drag those things around?
The porters may seem "pushy", but as far as I know.....nothing has been fished out of the harbor this year.
Have a safe flight from SLC to LAX.
David