Me and my family (4 of us altogether) are heading down to Universal mid-month. I've decided to buy an AP for me and then use that to buy their tickets at the discounted gate price. How do I buy tickets with the AP? I can't find that info anywhere. Do I have to go directly to the gate? Can I do it at the hotel when we check in? Lastly, we won't be going to the park on our arrival day. Can I head over the night we arrive and buy the tickets so we don't have to deal with it and miss park time on our first day? Thanks!