"Until the cops came"
I was wondering what would the translation of "We will jump off the cliff until the cops come" would be?
My guess is, Saltarémos de un risco hasta que vengan la policía. I'm incredibly unsure of the conjugation of venir though, thanks.
5 Answers
Apart from your sentence not really making sense (it would generally be difficult to repeat jumping off a cliff unless it was a very small one with a safe landing) I presume your focus is on whether hasta que is followed by the subjunctive or not so I shall address that question.
Hasta que is followed by the subjunctive when it introduces an anticipated situation, such as in your example because the polic have not yet arrived.
If it introduces a situation which is viewed as completed or habitual, it would be followed by the indicative.
Bear in mind that if there is no change of subject involved and a preposition is available, typically the preposition would be used with an infinitive.
Your sentence doesn't make sense. Are you going to be suspended in mid-air while waiting for the cops to arrive?
The English sentence makes sense, if the cliff is next to the ocean. This is popular at various seaside vacation spots in Mexico.
I read it as: We will continue to jump off the cliff, return to the top, and do this over and over again until ...
And, my error, the ocean is not necessarily implied, they could be BASE jumping. I have jumped into the ocean but I think that BASE jumping is insane.
I recommend ' parapente' that way you can stay air-borne until the situation clarifies. ¡Venga, hombre, venga!

Kiwi-Girl's answer covers the grammar.
However, I want to point out that your original English sentence is about "the cliff" and your original Spanish translation is about "a cliff."
Because your English sentence is about "cops" and not "police," you might want to look here and here for slang terms.