If given a one day pass by someone....does that person have to go with you to enter the park?

Yes

Yes they do

Yes if it's a bring a friend pass they have to be with you

Better to call and ask

I would call the park directly and make sure. That's one of those things you don't want to take a chance with getting misinformation. Always error on the side of caution.

Just someone with a season pass. It doesn't have to be that person specifically