From the first episode, Sora chases the thief who stole her luggage. While that doesn't sound very awesome by itself, she did it bouncing from awning to awning, all while wearing roller blades!
During the Kaleido Stage's production of The Little Mermaid. Sora's nailing of the trapeze stunt, involving doing a back flip through the waterfall and catching her partner was awesome. Once she got it wright.
Sora and Layla's performance of the 'Great Legendary Maneuver'.
Sora's explosive costume change during the climax of the final episode of the second season.