Happy Birthday, because I'll forget it 6 months from now.
Tip: Coordinate your late nights at Jellyrolls, drinking responsibly from 8pm-2am, with your sleep-in the following day. You wake up with that relaxed feeling and wanting a big breakfast. I wish I could've done my "legal drink" at Jellyrolls. Eat big before you go, then booze, water, booze, water... You don't want to look stupid at JR, so stop after 8 or 12 drinks. You don't want to miss the rest of the show or get a ride home from security.
The only park I endorse early days on is AK. The animals and staff are fresher, and the park closes really early. Yak and Yeti has great food.
DHS (MGM) is a commando dream since it's a lot of scheduled shows. We despise this park somewhat, but tolerate it as the shows are okay, the muppets are there, and sometimes there's something stupid in the street that makes you laugh.
The other two parks are pretty much whatever, and a Desperado can walk or sit aimlessly enjoying frosty, sugary, meatyness and booze.