Can we assume the rig is up, the cover is off and you are not planning any work below the waterline other than bottom paint? Not in order ... 1) Wax the topsides. 2) Apply bottom paint of your choice. 3) Check through hulls for operation, lubricate and close them all. 3.1) Check or change the raw water impeller. 3.2) Check all the hoses to thru hulls. 3.3) Put the blank in the speedo for the launch. 4) Charge the batteries. 5) Launch the boat. 6) Immediately check for any leaking. 7) Bend on the main and a 110 jib if you have furling. 8) Open the through hull for the seawater coolent!!! 9) Fire up the diesel! 10) Check for leaks, monitor the flow of water out the exhaust and engine temperature. Test the throttle and transmission operation. 11) Be happy. 12) Make sure you have a operational VHF and cell phone, flares, lifejackets, CHART, etc.
As you know it's not a long trip. But know your route and stick to the route you plan. There are rocks, ledges and reefs in-between. You will most likely be excited and the fewer decisions you have to make the better. I'm assuming you have a slip in Noack so you can do your cleaning of the deck and below there. If you are on a mooring I would have the boat squeaky clean before leaving, even if the yard charges some transient dockage fees.
If the yard does the fall service, and a spring commissioning of the engine, it should already have been run at the launch time. If you do those services they will likely move the boat to a slip from the lift well without starting the engine and charge you for it. You can be present at the launch and maybe start the motor yourself, but you will be uncomfortable messing around while the yard crew is trying to get another boat launched.
Don't neglect to visit Greenport this summer!