I won't advise you on whether or not to vote. Libertarians are split pretty evenly between "Don't vote, you are just giving authoritarianism your blessing", "Vote Libertarian because it is a useful protest and message", and "Vote for the major party candidate who has a hope of getting elected who is least bad." I will leave parsing all that to you.
However, if you do vote, I have one bit of advice I always give on propositions: Your default vote for any proposition (as it should be for legislators) should be "no". If its purpose is unclear, if you are not sure of the full implications, if you don't know how it is funded, if you haven't thought about unintended consequences, if you haven't heard the pitch from both the 'yes' and 'no' camps -- then vote no. Also beware that many Propositions that seem outwardly liberty-enhancing are actually Trojan Horses meant to be the opposite. Vote yes only if you have thought through all this and you are comfortable the new law would have a net positive benefit.
Also, via Maggies Farm, I think this is a good image for election day: