Pretty much what
@downunder said - try and check in as early as you can for the boofet- the last 5 years I've gotten checked-in around 5:20. Spend 30-40 minutes eating- and if your stomach is strong, GhostRider has historically been open during that time with no wait- so you can get a couple rides with 0 wait (and with it's awful capacity, this is your best chance to do it- by the time you're finished with a few haunts it'll be 2+ hours all night, and Fast Lane doesn't help).
There hasn't historically, when I've gone, been a massive crowd to get into the early-entry haunts. As long as you are by the back gate (right at GhostRider's exit) by around 6:20, you should easily be able to be one of the first people into the mazes. Most people will probably be flocking to the 2 new mazes- so based off past guest flow I would say knock out whatever is where The Depths was first (left-side, but not Wax Works) and then that exit should dump you, theoretically, close to where the 2nd new maze is (theoretically back-right corner). Then hit Bloodlines as it's still semi-new, and Wax Works as the last of the bunch as it likely won't have gained much a line at all during early entry.
Hope this all helps!!!