Just from my passing knowledge of One Piece and glancing at the wiki, I don't think Geppo works like how you think it might.

It doesn't have a trampoline effect, it merely allows people to push against non solid stuff like it was solid. Also, trying to bounce limbs off solid objects or stuff with Geppo would be detrimental, I would think, not unless you were to push against it, say like, leaping off the air with Geppo to add more strength to your attacks.

Thats my 2 cents on it anyways. Im just waiting for the map and the IC to start. Hopefully I dont get all my bunnies eaten from underground by those nids ;w;