What days and time are there the least people ? I’ve never been to a skatepark and I’d like to get a feel of it before falling in front of people.

From experience, usually between 2 and 4:30 during the week is pretty chill, during the weekend it's kind of unpredictable but early in the morning is always a good time

Yes they open at 2 and there is normally few people before 4, during the week that is. Never can tell on the weekends.

Check Google maps, they have those answers on a graph.