We are going to be flying into LAX for our upcoming trip in November and then spending 3 nights at DL, then going on a cruise departing from Los Angeles (San Pedro). There will be three of us.
After alot of research, I found that it was way cheaper for us to just rent a car,keeping it the length of our trip (parking at San Pedro pier while we are on our 4 night cruise), and then driving back to LAX for our flight home. We have an evening flight home after our cruise, so we plan on doing some touring of LA before our flight home.
Dollar car rental is about $100 for a compact car for a week. If we were to each pay for shuttles/cabs it would cost triple of what it is costing us to rent a car! It seems kind of silly to pay for a car for the length of our trip--but, it's cheaper. This way, we will be able to come & go without having to wait for shuttles, etc. I think that it costs about $12 a day to park at the pier.
I looked into doing one-way car rentals, but it still works out cheaper to keep the car for the entire time.
Hope this helps!
Maybe someone else will post some more info for you!