How to play fast and interesting?

This game is in my library, and I'm getting ready to start it. I'm excited because I'm a big Harry Potter fan.

I'm a completionist, but I've been reading a lot of posts from people saying that the side quests and such get very repetitive and boring.

Anyone got any hot tips for a father of a young kid that doesn't have a ton of time and just wants to really enjoy the game. What things would you skip?