I have to agree with MantisMan. Use the Magnum entrance. This is always my strategy. Hit Magnum first, continue to Gemini, then Mean Streak and CCMR. From here you retrace steps (again, this is my personal choice - you could use Frontier Trail to Hit MF before the TTR begins) and hit Gemini or Magnum again then head to Corkscrew
Next hit the Iron Dragon/Mantis/Wildcat trio.
We were able to do Magnum twice, Gemini twice, Mean Streak, CCMR, Corckscrew, Mantis, Iron Dragon, and Wildcat and get a TTR for MF by 12:15.
From here simply hit the three in the front (Raptor, Blue Streak, Disaster Transport) then return for your TTR time to MF.
If it works like it always seems to for us, you should have the big 12 done by 5pm and even have taken two rides on both Gemini and Magnum. If your really hardcore go catch a ride on Woodstock and while in Camp Snoopy find a youngster to ride Jr. Gemini with.
This has been our plan of attack since 1995 (modified for new coaster additions of course) and every year we're able to hit all the coasters on day one leaving the rest of the trip feeling a bit more relaxed.