To start with, make sure they don't drop it. :-)
Then, while I doubt it has one, make sure there is no drain plug that needs to be reinstalled. After it's in the water make sure all the seacocks are open and the strainers are clean and full of water. In some cases you may have to bleed air out of them to get a strainer to fill or a pump to prime. Then make sure all fuel lines are open. Do a thorough engines, engine room and systems check. Check the bilge pumps, make sure the battery switches are on as well as any appropriate breakers are on.
Take it slow after you fire everything up, watch the gauges and look around the engine room regularly. Keep an eye on the packing glands, check there temp. at least by hand. Having a good set of tools and an infrared heat gun could come in handy.