Take some of that orange marking paint and paint about a 10 ft diameter circle out in your runway. Try making that circle for touch and goes or just that being the first spot you hit for a landing.
Not really an aerobatic manuever but it's harder than you think and it's alot of fun.
(gotta watch out for the tendancy to apply full down elevator if your overshootin it though.. that can get ugly)[:-]