first off, if you go, definitely skate. it doesn't matter how skilled you are or what you're trying, as long as you don't get in everybody's way, which is what people really will notice and might get mad at you for.
as the other posters above suggested, go early and once you get there, prior to skating, please just take a minute aside to study what everybody else is doing - the turns people are taking, the obstacles everybody is trying to skate, the lines (the paths people take around the park), basically just watch the ongoing patterns and make sure you don't break them, that's pretty much how skateparks work and what defines whether or not you'll get in people's way. if you don't mess up the flow of the park people won't (or shouldn't) go after you.
common beginner mistake is to assume a skatepark is just some wild 'skate playground' where everybody is just doing everything at random, so you think you can do the same in return and claim whatever obstacle you feel like whenever you feel like going, snaking other people, never waiting for your turn (not even realizing people are trying to take turns)... newcomers need to develop a certain awareness of that in order to grasp how a skatepark functions but really once you have you realize it's just basic common sense.
with that in mind don't overthink things, just go and skate !