How to say “We were going to rent a jet ski for half an hour, but at eighty bucks we got ice cream instead.” in Japanese

In Japanese

三十分(さんじゅっぷん)だけ水上(すいじょう)バイクを借(か)りようと思(おも)ったら一万円(いちまんえん)って言(い)われて、かき氷(ごおり)にした。

Sanjuppun dake suijō baiku o kariyō to omottara ichiman-en tte iwarete, kakigōri ni shita.