Keep on top of oil changes and change the oil filter every 2nd time (that said I change it almost every time so I get more old oil out.) You should do a valve clearance check at the 28k service and then you can probably forget about it until around 60k. Change the air filter when it looks dirty or as per the schedule. Coolant fluid and break fluid are often oversights, they don't need changing that often. I hardly ever change coolant, I've only done so twice in the last 80k miles and once was because I restored the bike and had to take the radiator off. Brake fluid gets changed when it goes dark or when I service the brakes, the latter happens more often, once or twice a year. While on the subject of brakes, it doesn't hurt to take the calipers off and give them a good clean, particularly if you ride in winter when there's salt on the roads. Don't forget about spark plugs, even if you use iridium plugs that last ages, at least take them out and check that they are clean enough and that the gap is correct. Fork oil is also often an oversight, it's an easy job to drain the old oil and put fresh oil in. On budget forks, like the Wee has, it's a worthwhile exercise.
Other than that there's not much that really needs doing to keep the bike going well apart from the normal stuff like taking care of your chain, tyres and other such wearing items.
