This was a generic boat checklist I made years ago.
Besides the obvious of checking all hull, decking, tubes, welds, etc to be free from flaws or defects, this is what I look for.
BOAT:
*Manuals:
Boat
Trailer
Stereo / GPS / FFS (provided by manufacture)
Stereo faceplate removal keys (if equipped)
Orientation DVD (if equipped)
* 2 sets of ignition keys with safety kill switch
*Temp boat registration
* All interior compartment plugs (3rd toon / ski locker) are present
* Battery / Batteries and switch function properly
*Fire extinguisher / flares / life jackets / throwable cushion (if dealer equips with safety package)
*Table and table leg are in storage compartment
*Portable cupholders are present
*Verify the following work:
All interior / exterior / speaker lights (including Bimini lights if equipped)
Tower lights & speakers
Blower (if equipped with I/O engine)
Bilge pump cycles (if equipped)
Stereo and sound from stern remote (if equipped)
GPS / Fishfinder / Gauges at helm and rocker switches
Bimini top in the up and stowed position
*Check for overflow tube with livewell is present and make sure pump turns on (if equipped)
*Changing station folds and unfolds (if equipped)
*Ski tow pylon is present (if equipped)
*Playpen cover has all poles present
*Boarding / swim ladder deploys and stores properly
TRAILER:
*Surge brake lockout key (if equipped). Make sure brake fluid reservoir is full.
*Tongue cam pin (if equipped with swing away tongue)
*Transom Straps
* Temp Trailer Tag
* Check brakes for operation in parking lot before you leave dealer
*Verify all lights work
* Verify 50PSI in all tires (verify correct tire pressure as it will vary with trailer / tire size)
(Don't forget the spare)
*2" Ball (or appropriate size depending on trailer)
*Verify proper drop size hitch to match trailer to tow vehicle
*Correct 4 way / 5 way flat and or 7 way round trailer electrical hook up
*Make sure you have lug wrench (typical ¾”) and wheel chock / jack in case you have flat tire on way home from dealership
MOTOR:
*If you don’t get a water test, hook up to muffs to make sure motor turns over and runs
*Make sure mounting height is correct. Cavitation plate should be level with motor pod or bottom of center toon (estimate as it may need adjustments after you run the boat to see how it performs)