A question. I haven't yet purchased my tickets for Universal (doing it soon so they can arrive in time for my trip). I'm planning on making dinner reservations at Citywalk for around 7ish so I can get the most out of IOA. Is there enough to do in one park (IOA) from open till close or should I spring the extra 60 bucks (There's 2 of us) to do the park to park? I have NEVER been to universal and I'm just curious. We're visiting on halloween.