Well, it might be her bold personality, the way she carries herself, and the way she's designed visually that makes Lana Lang in DC cartoons seem sexy and hot. Maybe it's also the combination of her actions and expressions that add to that appeal.
A great day in a funny cartoon often involves unexpected situations that lead to crazy and funny moments. Maybe a character's crazy plan going hilariously wrong or a bunch of friends having a wild time together. Also, colorful and lively animations add to the fun.