landing
Someone who lands ok without any training is impressive but of course you only get one chance and the impression disappears if it is later proven it was luck. After that the trick is not to impress the instructor since most ways of doing this includes scaring him...
Some plus points: (guess his is what you aimed for)
well flown approach (good on speeds, corrections to glidepath when needed, aware of other traffic, corrected for wind, well trimmed)
everything done in time (calmly) in the circuit
smooth handling of controls
good judgement of height in the flare (look at end of runway)
landing in the region of intended touchdown mark (size depends on student experience) on main gear with little or no excess speed and nose pointing in the direction of the runway.
Trick is to do everything within limits rather than something extremely well while forgetting something else.