Unless you are staying at one of the on-site hotels, and NOT Cabana Bay, you can't get to the turnstiles that early. CityWalk is cleared of day guests starting at 2 AM, the parking garages don't open until 6:30 on a 9 AM opening day (5:30 for 8 AM days), and even if you did manage to somehow get into the parking garages, you can't get past the security checkpoint. I've seen guests who have arrived really early, and security holds them up (BTR concert perfect example). Don't forget we have security in the entire resort 24 hours a day, so I don't recommend trying to get there super early on whatever day grand opening is.