Lights
OK, this one is pretty obvious, but over and above (literally) the headlight, taillight, and turn signals are those little lamps we often call "idiot lights," as well as the ones that light the gauges at night. You might as well make sure they all work in case you get caught out after curfew. Dressers have additional bulbs to bear in mind, in everything from the saddlebag rails to the fender tips.
Oil-Especially Engine Oil
Spring "cleaning" for an engine, transmission, and primary practically mandates fresh fluids (of the correct type for the task at hand), and-perhaps even more importantly-checking for condensation hiding inside those vital areas. Open the primary inspection covers and wipe the inside of the outer primary with your index finger. Feel anything moist? Even garage-kept scooters occasionally surprise their owners with a little muddy brown mix of oil and water that has accumulated during months of inactivity. If it's happening in the primary, it pays to check the oil tank/sump and the transmission case as well. Flushing these components and frequently refilling them with fresh lube is easier and better than rebuilding them after corrosives have gotten into bearings and rollers. Another tip is to pay less attention to mileage and more to condition when it comes to oil-change intervals. Short hops are harder on oil than long rides, so check all your vital fluids every second or third fuel fill-up. If your engine's oil looks dirty or smells bad, or if condensation rears its ugly head in the trans or primary, it's time to change it, regardless of mileage.
Even if your spring service work is strictly DIY, checks like these are essential. Since two heads are better than one, whether you talk to a dealer or a knowledgeable buddy, it's good to get a second opinion. Another perspective never hurts when you're trying to see if you've remembered and done everything the scooter needs for the first ride of the season.
Equipment
The motorcycle isn't all there is to it, after all. Ensure that you thoroughly check your riding gear and safety equipment before putting it to use for the new riding season. Pay particular attention to helmet straps, visors, and face shields. Damage is easy and fairly cheap to fix as a rule, and where face shields are concerned, it's more important to see well than to look good.
If you have protective clothing (leathers, chaps, gloves, boots, and such), now is the time to clean them and rub 'em down with a good leather treatment. Then wear it all, even if your intended journey is only a short one. You might find that you're a lot rustier than the sled or your apparel after months out of practice. And accidents and incidents can and do bring a quick end to the beginning of even a short ride.
Luggage and Accessories
Use common sense when loading your machine or fitting additional accessories. When big loads are carried, you should travel at a much lower speed than normal and try to keep as much of the weight as possible between the tires, not hanging off the ends of your scooter. Don't forget to set tire pressures higher, as recommended by the factory for passenger or load carrying.
Rider
Speaking of payloads-as with any other activity, to be proficient you need to acknowledge that preparation and practice are worth their weight in gold. So consider riding an appropriate "maiden voyage" route on your own, or with one close buddy, avoiding group riding at first.
Don't take on too long a journey too soon-avoid demanding routes or speeds until you re-familiarize yourself with the controls and handling of your bike. Historically, lots of fatal and serious-injury accidents take place early in the biking calendar. Remember, risk-taking is amplified by poor preparation, whether mental or mechanical. Think of your quality of life and how easily it can be destroyed, not to mention the people around you who need you to come home safely.