If you go onto the P&O site and register on their Community section you will find lots of information both about Artemis and the Panama Canal trip. We are doing the Canal trip on Oceana but not until 2010.
The Artemis used to be called Royal Princess so if you look on this sites cruise reviews for Royal Princess you will find a number of reviews.
The panama canal is amazing, did the same trip on adonia when it was with p&o, unsure of all your ports of call but starting with Acapulco, if you have time here don't make the mistake we did, on leaving the ship and on to main road, the better area is a couple of miles to the right, you can easily get to the rock diving by taxi, there is a restaurant which overlooks the diving area it is minimal to get in and you get two drinks within the price, don't worry if someone comes up to you to take you to this restaurant, they are not out to rip you off.. Our flying time was 13 from manchester with a stop over to refuel for an hour in cuba, so unsure why it is taking you another 3 hours. most of the ports are fantastic especially aruba, a word of warning, if the ship stops in panama city, I would advise you to stay on the ship, in my experience it was dangerous to venture a shore on your own, plus the people who opted for a organised coachtrip had to share there seats with cockroaches. I have been on 20+ cruises and the panama canal trip is by far the best cruise I have ever had. Have a great time, freinds of ours are doing it in March.
Just arrived home from M.V. arthritis on 30th noy .Thomson flight was best long haul we have ever had,stopover in miami to refuel approx 2 hours.we only went on two tours(acapulco and colon to see canal).EVERYWHERE ELSE WAS SAFE ENOUGH JUST TO WALK OFF AND MOSTLY NEAR TO BEACHES/SHOPPING AREAS.We were on trip p816 if you want to check our ports of call.We travelled east to west wouldnt have missed it .set your alarm as fellow passengers will be five deep at the pointy end as you get to the first lock.Enjoy the experience,we certainly did!