Items we consider important to consider for activating your boat for the upcoming season if they weren't performed at winterization:
Bottom paint with antifouling. Antifouling paint on outdrives and running gear. Most paints require reapplication before each season. Wax your hull with tp protect gel coat if desired.
Change your primary and secondary fuel filter elements as a matter of course. Chances are there is still life left in them, but that's not a chance you want to take. Again, it's cheap insurance.
Check zincs, replace if needed. Prop shaft, rudders, heat exchangers, outdrives, outboards and larger hulls all have these sacrificial anodes.
Clean all battery connections and reconnect, check all electrical accessories.
Sea trial boat if engine work has been performed to check for proper shifting, engine temperature, charging system, pumps and recommended rpm is reached at full throttle.