All depends on where you want to spend your time waiting. 1:30-1:15 before the park opens assures you of being one of the first couple dozen of being on the attraction (so long as you walk with a purpose, etc). You can arrive 1:00 before park opens and save :30 minutes right there, but you could end up waiting that long to get on the attraction. If you're able to get there at 7:40-7:45, that would be ideal. Like, at the tapstiles, past bag check by 7:45