To my knowledge there isn't any other maintenance per se other than keeping it clean.
I check for tightness on screws on the wiring harness now and then and I'd strongly suggest you get some good marine grade anti corrosion spray lube and also a small grease gun with blue marine grade grease and locate the lube points on the engine and control cables, give them a shot once or twice a season, also get up inder the console and check the tightness of all your screw down electrical connections and then give them a good spritz of the spray lube.
I had some loose connections right out of the factory on a new boat that started to come loose after a couple of trips, (Stuff happens, just tighten them up again) no biggie.
Also check the snugness of the grab rail bolts and the side rail screws. Don't over tighten them as thay can strip but they should be snug.
Probably take you 30 minutes to do unless you stop for a beer or two then you might be at it all afternoon
Something else you might do is pull your prop and make sure the shaft is well greased and there is no fishing line built up under there which is bad for the lower unit seals, remember to torque the prop nut back (I think it's 29 ft pounds) check you manuel for the proper specs