* Quiero ir de fiesta: This is a straightforward and common way to say "I want to go partying." It's suitable for most situations.
* Tengo ganas de fiesta: This translates to "I have a desire for a party" or "I feel like partying." It expresses a stronger feeling than just wanting to go.
* Quiero fiestear: This is a more informal and slightly slangy way of saying "I want to party."
* Me apetece una fiesta: This translates to "I fancy a party" or "I feel like having a party." It's a more relaxed and less forceful way of expressing your desire.
* Vamos de fiesta!: This translates to "Let's go party!" This is an invitation rather than a statement of wanting to party, but it conveys the same sentiment.
The best option depends on the context. For most situations, Quiero ir de fiesta is a safe and accurate choice.