Just got off the Dream-- ran the CC 5K yesterday. The heat/humidity is rough, and while the airstrip has a good breeze, it can get pretty still on the observation tower loop. There are about 4 water stations that are on that loop all the time, along with one at the start. Additionally, there was a CM who had cups of water available at the turn-off to the loop.
There were definitely some improvements since we ran last August:
1) Met on the ship in 687 at 8:30AM, where they had a map of the course and you signed up with your stateroom (this resulted in a certificate arriving at the room that night).
2) At 8:45AM, we all disembarked together. Once off the ship, the Shutters photographer took a group photo, which included Goofy in his tracksuit. This photo was just on the wall in Shutters-- it did not show up in our folder.
3) We had the option to walk or tram out to the start at the bike rental place. A few more runners met us there. There is a large box where you can store your bag, which is clearly visible to the CMs staffing the bike rental as well as the CM who waits at the finish to hand out the "Mickey Medals". They had a big digital timer at the start/finish. We started running at 9:15AM.
4) The CC 5K shirts are only available at the shop near the finish line. We bought ours right after the race, because I didn't want them to run out of sizes (they are unisex shirts).
The finishing times went from probably 20 mins to over 60 mins. There are definitely a number of people who walk the whole thing.
Last year, we were just finishing up Couch-to-5K when we ran the CC5K in 35:45. This year, post-Princess 1/2/pre-DL 1/2 we improved by 5 minutes to 30:45! Beware, the heat will really slow you down. Make sure you take advantage of all the water along the way!